Multiline `tags`/`labels` with version `1.0.1` are split into `1`, `.0`, `.1` in generated `docker buildx` command

### Contributing guidelines

- [x] I've read the [contributing guidelines](https://github.com/docker/build-push-action/blob/master/.github/CONTRIBUTING.md) and wholeheartedly agree

### I've found a bug, and:

- [x] The documentation does not mention anything about my problem
- [x] There are no open or closed issues that are related to my problem

### Description

Multiline tag expression aimed to create two tags (`name:1.0.1` and `name:latest`) seems to be split not only by next line symbol but also by dots, creating invalid buildx commands and therefore failing the build. Verified only with multiline syntax.

### Expected behaviour

The final `docker buildx build` command should contain:

--tag user/devops-info-service:1.0.1
--tag user/devops-info-service:latest
--label DEBUG_VERSION=1.0.1
--label DEBUG_MAJOR=1
--label DEBUG_MINOR=0
--label DEBUG_PATCH=1

### Actual behaviour

In the job log I consistently see:

/usr/bin/docker buildx build \
  --build-arg MAJOR_VERSION=1 \
  --build-arg MINOR_VERSION=0 \
  --build-arg PATCH_VERSION=1 \
  --iidfile ... \
  --label DEBUG_VERSION=1 \
  --label .0 \
  --label .1 \
  --label DEBUG_MAJOR=1 \
  --label DEBUG_MINOR=0 \
  --label DEBUG_PATCH=1 \
  --tag controlw/devops-info-service:1 \
  --tag .0 \
  --tag .1 \
  --tag controlw/devops-info-service:latest \
  --push .

This causes Buildx to fail with:

```text
ERROR: failed to build: invalid tag ".0": invalid reference format
```

So a single logical version `1.0.1` (in both `tags` and `labels`) seems to be split into three elements: `1`, `.0`, `.1`.

### Repository URL

https://github.com/DmitriyProkopyev/DevOps-Core-Course

### Workflow run URL

https://github.com/DmitriyProkopyev/DevOps-Core-Course/actions/runs/22320604083/job/64577594648

### YAML workflow

```yaml
name: lab-testing
on:
  push:
    branches: [ master, lab03 ]
  pull_request:
    branches: [ master ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Get code
        uses: actions/checkout@v4

      - name: Setup python
        uses: actions/setup-python@v4
        with:
          python-version: '3.12.10'

      - name: Install development dependencies
        run: |
          python -m venv venv
          pip install -r app_python/requirements-dev.txt
      - name: Run linter
        run: ruff check app_python/

      - name: Run unit tests
        run: pytest app_python/tests/

  release:
    needs: test
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request' && github.base_ref == 'master'

    steps:
      - name: Get code
        uses: actions/checkout@v4

      - name: Read version
        id: version
        run: |
          set -e
          MAJOR_VERSION=$(grep '^MAJOR_VERSION=' app_python/version.env | cut -d '=' -f2-)
          MINOR_VERSION=$(grep '^MINOR_VERSION=' app_python/version.env | cut -d '=' -f2-)
          PATCH_VERSION=$(grep '^PATCH_VERSION=' app_python/version.env | cut -d '=' -f2-)
          VERSION="${MAJOR_VERSION}.${MINOR_VERSION}.${PATCH_VERSION}"
          {
            echo "MAJOR_VERSION=$MAJOR_VERSION"
            echo "MINOR_VERSION=$MINOR_VERSION"
            echo "PATCH_VERSION=$PATCH_VERSION"
            echo "VERSION=$VERSION"
          } >> "$GITHUB_OUTPUT"
      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          build-args: |
            MAJOR_VERSION=${{ steps.version.outputs.MAJOR_VERSION }}
            MINOR_VERSION=${{ steps.version.outputs.MINOR_VERSION }}
            PATCH_VERSION=${{ steps.version.outputs.PATCH_VERSION }}
          tags: |
            controlw/devops-info-service:${{ steps.version.outputs.VERSION }}
            controlw/devops-info-service:latest
          labels: |
            DEBUG_VERSION=${{ steps.version.outputs.VERSION }}
            DEBUG_MAJOR=${{ steps.version.outputs.MAJOR_VERSION }}
            DEBUG_MINOR=${{ steps.version.outputs.MINOR_VERSION }}
            DEBUG_PATCH=${{ steps.version.outputs.PATCH_VERSION }}
```

### Workflow logs

2026-02-23T19:03:20.7487233Z Current runner version: '2.331.0'
2026-02-23T19:03:20.7519962Z ##[group]Runner Image Provisioner
2026-02-23T19:03:20.7521395Z Hosted Compute Agent
2026-02-23T19:03:20.7522251Z Version: 20260123.484
2026-02-23T19:03:20.7523273Z Commit: 6bd6555ca37d84114959e1c76d2c01448ff61c5d
2026-02-23T19:03:20.7524382Z Build Date: 2026-01-23T19:41:17Z
2026-02-23T19:03:20.7525422Z Worker ID: {b213b0cc-8e08-415b-9fa1-e58170e8adfa}
2026-02-23T19:03:20.7526646Z Azure Region: eastus
2026-02-23T19:03:20.7527413Z ##[endgroup]
2026-02-23T19:03:20.7529913Z ##[group]Operating System
2026-02-23T19:03:20.7530908Z Ubuntu
2026-02-23T19:03:20.7531600Z 24.04.3
2026-02-23T19:03:20.7532339Z LTS
2026-02-23T19:03:20.7533262Z ##[endgroup]
2026-02-23T19:03:20.7533993Z ##[group]Runner Image
2026-02-23T19:03:20.7534836Z Image: ubuntu-24.04
2026-02-23T19:03:20.7535760Z Version: 20260201.15.1
2026-02-23T19:03:20.7537667Z Included Software: https://github.com/actions/runner-images/blob/ubuntu24/20260201.15/images/ubuntu/Ubuntu2404-Readme.md
2026-02-23T19:03:20.7540497Z Image Release: https://github.com/actions/runner-images/releases/tag/ubuntu24%2F20260201.15
2026-02-23T19:03:20.7542028Z ##[endgroup]
2026-02-23T19:03:20.7546577Z ##[group]GITHUB_TOKEN Permissions
2026-02-23T19:03:20.7549694Z Actions: write
2026-02-23T19:03:20.7550616Z ArtifactMetadata: write
2026-02-23T19:03:20.7551498Z Attestations: write
2026-02-23T19:03:20.7552350Z Checks: write
2026-02-23T19:03:20.7553231Z Contents: write
2026-02-23T19:03:20.7553975Z Deployments: write
2026-02-23T19:03:20.7554867Z Discussions: write
2026-02-23T19:03:20.7555723Z Issues: write
2026-02-23T19:03:20.7556528Z Metadata: read
2026-02-23T19:03:20.7557286Z Models: read
2026-02-23T19:03:20.7558105Z Packages: write
2026-02-23T19:03:20.7559147Z Pages: write
2026-02-23T19:03:20.7560086Z PullRequests: write
2026-02-23T19:03:20.7561017Z RepositoryProjects: write
2026-02-23T19:03:20.7562001Z SecurityEvents: write
2026-02-23T19:03:20.7562812Z Statuses: write
2026-02-23T19:03:20.7563698Z ##[endgroup]
2026-02-23T19:03:20.7566684Z Secret source: Actions
2026-02-23T19:03:20.7567748Z Prepare workflow directory
2026-02-23T19:03:20.8018522Z Prepare all required actions
2026-02-23T19:03:20.8073296Z Getting action download info
2026-02-23T19:03:21.1734089Z Download action repository 'actions/checkout@v4' (SHA:34e114876b0b11c390a56381ad16ebd13914f8d5)
2026-02-23T19:03:21.5287924Z Download action repository 'docker/login-action@v3' (SHA:c94ce9fb468520275223c153574b00df6fe4bcc9)
2026-02-23T19:03:21.8526095Z Download action repository 'docker/build-push-action@v6' (SHA:10e90e3645eae34f1e60eeb005ba3a3d33f178e8)
2026-02-23T19:03:22.2458938Z Complete job name: release
2026-02-23T19:03:22.3273709Z ##[group]Run actions/checkout@v4
2026-02-23T19:03:22.3274986Z with:
2026-02-23T19:03:22.3275866Z   repository: DmitriyProkopyev/DevOps-Core-Course
2026-02-23T19:03:22.3277264Z   token: ***
2026-02-23T19:03:22.3277993Z   ssh-strict: true
2026-02-23T19:03:22.3279118Z   ssh-user: git
2026-02-23T19:03:22.3279951Z   persist-credentials: true
2026-02-23T19:03:22.3280885Z   clean: true
2026-02-23T19:03:22.3281689Z   sparse-checkout-cone-mode: true
2026-02-23T19:03:22.3282651Z   fetch-depth: 1
2026-02-23T19:03:22.3283407Z   fetch-tags: false
2026-02-23T19:03:22.3284192Z   show-progress: true
2026-02-23T19:03:22.3284979Z   lfs: false
2026-02-23T19:03:22.3285692Z   submodules: false
2026-02-23T19:03:22.3286489Z   set-safe-directory: true
2026-02-23T19:03:22.3287658Z ##[endgroup]
2026-02-23T19:03:22.4385348Z Syncing repository: DmitriyProkopyev/DevOps-Core-Course
2026-02-23T19:03:22.4388052Z ##[group]Getting Git version info
2026-02-23T19:03:22.4389935Z Working directory is '/home/runner/work/DevOps-Core-Course/DevOps-Core-Course'
2026-02-23T19:03:22.4392003Z [command]/usr/bin/git version
2026-02-23T19:03:22.5365503Z git version 2.52.0
2026-02-23T19:03:22.5393729Z ##[endgroup]
2026-02-23T19:03:22.5409212Z Temporarily overriding HOME='/home/runner/work/_temp/77e65b03-a3b2-4a7a-b622-6ca96bda721c' before making global git config changes
2026-02-23T19:03:22.5412311Z Adding repository directory to the temporary git global config as a safe directory
2026-02-23T19:03:22.5415198Z [command]/usr/bin/git config --global --add safe.directory /home/runner/work/DevOps-Core-Course/DevOps-Core-Course
2026-02-23T19:03:22.5492634Z Deleting the contents of '/home/runner/work/DevOps-Core-Course/DevOps-Core-Course'
2026-02-23T19:03:22.5495670Z ##[group]Initializing the repository
2026-02-23T19:03:22.5500369Z [command]/usr/bin/git init /home/runner/work/DevOps-Core-Course/DevOps-Core-Course
2026-02-23T19:03:22.6034765Z hint: Using 'master' as the name for the initial branch. This default branch name
2026-02-23T19:03:22.6037029Z hint: will change to "main" in Git 3.0. To configure the initial branch name
2026-02-23T19:03:22.6039302Z hint: to use in all of your new repositories, which will suppress this warning,
2026-02-23T19:03:22.6040925Z hint: call:
2026-02-23T19:03:22.6041733Z hint:
2026-02-23T19:03:22.6042746Z hint: 	git config --global init.defaultBranch <name>
2026-02-23T19:03:22.6044050Z hint:
2026-02-23T19:03:22.6045238Z hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
2026-02-23T19:03:22.6047260Z hint: 'development'. The just-created branch can be renamed via this command:
2026-02-23T19:03:22.6048870Z hint:
2026-02-23T19:03:22.6049620Z hint: 	git branch -m <name>
2026-02-23T19:03:22.6050459Z hint:
2026-02-23T19:03:22.6051592Z hint: Disable this message with "git config set advice.defaultBranchName false"
2026-02-23T19:03:22.6090271Z Initialized empty Git repository in /home/runner/work/DevOps-Core-Course/DevOps-Core-Course/.git/
2026-02-23T19:03:22.6105487Z [command]/usr/bin/git remote add origin https://github.com/DmitriyProkopyev/DevOps-Core-Course
2026-02-23T19:03:22.6189716Z ##[endgroup]
2026-02-23T19:03:22.6192149Z ##[group]Disabling automatic garbage collection
2026-02-23T19:03:22.6194414Z [command]/usr/bin/git config --local gc.auto 0
2026-02-23T19:03:22.6225072Z ##[endgroup]
2026-02-23T19:03:22.6227282Z ##[group]Setting up auth
2026-02-23T19:03:22.6233398Z [command]/usr/bin/git config --local --name-only --get-regexp core\.sshCommand
2026-02-23T19:03:22.6266874Z [command]/usr/bin/git submodule foreach --recursive sh -c "git config --local --name-only --get-regexp 'core\.sshCommand' && git config --local --unset-all 'core.sshCommand' || :"
2026-02-23T19:03:22.7783202Z [command]/usr/bin/git config --local --name-only --get-regexp http\.https\:\/\/github\.com\/\.extraheader
2026-02-23T19:03:22.7822604Z [command]/usr/bin/git submodule foreach --recursive sh -c "git config --local --name-only --get-regexp 'http\.https\:\/\/github\.com\/\.extraheader' && git config --local --unset-all 'http.https://github.com/.extraheader' || :"
2026-02-23T19:03:22.8084597Z [command]/usr/bin/git config --local --name-only --get-regexp ^includeIf\.gitdir:
2026-02-23T19:03:22.8119270Z [command]/usr/bin/git submodule foreach --recursive git config --local --show-origin --name-only --get-regexp remote.origin.url
2026-02-23T19:03:22.8356848Z [command]/usr/bin/git config --local http.https://github.com/.extraheader AUTHORIZATION: basic ***
2026-02-23T19:03:22.8393059Z ##[endgroup]
2026-02-23T19:03:22.8394545Z ##[group]Fetching the repository
2026-02-23T19:03:22.8402217Z [command]/usr/bin/git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +f0f21b308bc789853777b84cf99d3371bbef3c44:refs/remotes/pull/7/merge
2026-02-23T19:03:23.2180521Z From https://github.com/DmitriyProkopyev/DevOps-Core-Course
2026-02-23T19:03:23.2183975Z  * [new ref]         f0f21b308bc789853777b84cf99d3371bbef3c44 -> pull/7/merge
2026-02-23T19:03:23.2266279Z ##[endgroup]
2026-02-23T19:03:23.2267980Z ##[group]Determining the checkout info
2026-02-23T19:03:23.2269780Z ##[endgroup]
2026-02-23T19:03:23.2273549Z [command]/usr/bin/git sparse-checkout disable
2026-02-23T19:03:23.2362317Z [command]/usr/bin/git config --local --unset-all extensions.worktreeConfig
2026-02-23T19:03:23.2389826Z ##[group]Checking out the ref
2026-02-23T19:03:23.2393596Z [command]/usr/bin/git checkout --progress --force refs/remotes/pull/7/merge
2026-02-23T19:03:23.2586711Z Note: switching to 'refs/remotes/pull/7/merge'.
2026-02-23T19:03:23.2588123Z 
2026-02-23T19:03:23.2589500Z You are in 'detached HEAD' state. You can look around, make experimental
2026-02-23T19:03:23.2592007Z changes and commit them, and you can discard any commits you make in this
2026-02-23T19:03:23.2593700Z state without impacting any branches by switching back to a branch.
2026-02-23T19:03:23.2594891Z 
2026-02-23T19:03:23.2595843Z If you want to create a new branch to retain commits you create, you may
2026-02-23T19:03:23.2597462Z do so (now or later) by using -c with the switch command. Example:
2026-02-23T19:03:23.2598612Z 
2026-02-23T19:03:23.2599248Z   git switch -c <new-branch-name>
2026-02-23T19:03:23.2599901Z 
2026-02-23T19:03:23.2600253Z Or undo this operation with:
2026-02-23T19:03:23.2600825Z 
2026-02-23T19:03:23.2601138Z   git switch -
2026-02-23T19:03:23.2601582Z 
2026-02-23T19:03:23.2602336Z Turn off this advice by setting config variable advice.detachedHead to false
2026-02-23T19:03:23.2603430Z 
2026-02-23T19:03:23.2604610Z HEAD is now at f0f21b3 Merge 91ed4fed26cb58b8f6965f3064e6f13be0f080a8 into 8b3561250ea44f1b99718ea5f83783b6a5d340da
2026-02-23T19:03:23.2607931Z ##[endgroup]
2026-02-23T19:03:23.2631868Z [command]/usr/bin/git log -1 --format=%H
2026-02-23T19:03:23.2653710Z f0f21b308bc789853777b84cf99d3371bbef3c44
2026-02-23T19:03:23.2869735Z ##[group]Run set -e
2026-02-23T19:03:23.2870644Z [36;1mset -e[0m
2026-02-23T19:03:23.2871361Z [36;1m[0m
2026-02-23T19:03:23.2872595Z [36;1mMAJOR_VERSION=$(grep '^MAJOR_VERSION=' app_python/version.env | cut -d '=' -f2-)[0m
2026-02-23T19:03:23.2874641Z [36;1mMINOR_VERSION=$(grep '^MINOR_VERSION=' app_python/version.env | cut -d '=' -f2-)[0m
2026-02-23T19:03:23.2876655Z [36;1mPATCH_VERSION=$(grep '^PATCH_VERSION=' app_python/version.env | cut -d '=' -f2-)[0m
2026-02-23T19:03:23.2878134Z [36;1m[0m
2026-02-23T19:03:23.2879306Z [36;1mVERSION="${MAJOR_VERSION}.${MINOR_VERSION}.${PATCH_VERSION}"[0m
2026-02-23T19:03:23.2880597Z [36;1m[0m
2026-02-23T19:03:23.2881254Z [36;1m{[0m
2026-02-23T19:03:23.2882027Z [36;1m  echo "MAJOR_VERSION=$MAJOR_VERSION"[0m
2026-02-23T19:03:23.2883149Z [36;1m  echo "MINOR_VERSION=$MINOR_VERSION"[0m
2026-02-23T19:03:23.2884271Z [36;1m  echo "PATCH_VERSION=$PATCH_VERSION"[0m
2026-02-23T19:03:23.2885377Z [36;1m  echo "VERSION=$VERSION"[0m
2026-02-23T19:03:23.2886308Z [36;1m} >> "$GITHUB_OUTPUT"[0m
2026-02-23T19:03:23.2923322Z shell: /usr/bin/bash -e {0}
2026-02-23T19:03:23.2924204Z ##[endgroup]
2026-02-23T19:03:23.3266519Z ##[group]Run docker/login-action@v3
2026-02-23T19:03:23.3267474Z with:
2026-02-23T19:03:23.3268145Z   username: controlw
2026-02-23T19:03:23.3269498Z   password: ***
2026-02-23T19:03:23.3270228Z   logout: true
2026-02-23T19:03:23.3270911Z ##[endgroup]
2026-02-23T19:03:23.6264961Z Logging into docker.io...
2026-02-23T19:03:24.8021008Z Login Succeeded!
2026-02-23T19:03:24.8246290Z ##[group]Run docker/build-push-action@v6
2026-02-23T19:03:24.8246693Z with:
2026-02-23T19:03:24.8247036Z   context: .
2026-02-23T19:03:24.8247291Z   push: true
2026-02-23T19:03:24.8247616Z   build-args: MAJOR_VERSION=1
MINOR_VERSION=0
PATCH_VERSION=1

2026-02-23T19:03:24.8248314Z   tags: controlw/devops-info-service:1
.0
.1
controlw/devops-info-service:latest

2026-02-23T19:03:24.8249173Z   labels: DEBUG_VERSION=1
.0
.1
DEBUG_MAJOR=1
DEBUG_MINOR=0
DEBUG_PATCH=1

2026-02-23T19:03:24.8249695Z   load: false
2026-02-23T19:03:24.8249942Z   no-cache: false
2026-02-23T19:03:24.8250174Z   pull: false
2026-02-23T19:03:24.8250755Z   github-token: ***
2026-02-23T19:03:24.8251041Z ##[endgroup]
2026-02-23T19:03:25.0609061Z ##[group]GitHub Actions runtime token ACs
2026-02-23T19:03:25.0621365Z refs/pull/7/merge: read/write
2026-02-23T19:03:25.0622338Z refs/heads/master: read
2026-02-23T19:03:25.0623524Z ##[endgroup]
2026-02-23T19:03:25.0624512Z ##[group]Docker info
2026-02-23T19:03:25.0698627Z [command]/usr/bin/docker version
2026-02-23T19:03:25.0916816Z Client: Docker Engine - Community
2026-02-23T19:03:25.0922100Z  Version:           28.0.4
2026-02-23T19:03:25.0922557Z  API version:       1.48
2026-02-23T19:03:25.0922968Z  Go version:        go1.23.7
2026-02-23T19:03:25.0923384Z  Git commit:        b8034c0
2026-02-23T19:03:25.0923792Z  Built:             Tue Mar 25 15:07:16 2025
2026-02-23T19:03:25.0924271Z  OS/Arch:           linux/amd64
2026-02-23T19:03:25.0924672Z  Context:           default
2026-02-23T19:03:25.0924918Z 
2026-02-23T19:03:25.0925106Z Server: Docker Engine - Community
2026-02-23T19:03:25.0925556Z  Engine:
2026-02-23T19:03:25.0925872Z   Version:          28.0.4
2026-02-23T19:03:25.0926338Z   API version:      1.48 (minimum version 1.24)
2026-02-23T19:03:25.0926832Z   Go version:       go1.23.7
2026-02-23T19:03:25.0927227Z   Git commit:       6430e49
2026-02-23T19:03:25.0927649Z   Built:            Tue Mar 25 15:07:16 2025
2026-02-23T19:03:25.0928158Z   OS/Arch:          linux/amd64
2026-02-23T19:03:25.0928593Z   Experimental:     false
2026-02-23T19:03:25.0929231Z  containerd:
2026-02-23T19:03:25.0929567Z   Version:          v2.2.1
2026-02-23T19:03:25.0930124Z   GitCommit:        dea7da592f5d1d2b7755e3a161be07f43fad8f75
2026-02-23T19:03:25.0930662Z  runc:
2026-02-23T19:03:25.0930960Z   Version:          1.3.4
2026-02-23T19:03:25.0931348Z   GitCommit:        v1.3.4-0-gd6d73eb8
2026-02-23T19:03:25.0931774Z  docker-init:
2026-02-23T19:03:25.0932112Z   Version:          0.19.0
2026-02-23T19:03:25.0932504Z   GitCommit:        de40ad0
2026-02-23T19:03:25.0971364Z [command]/usr/bin/docker info
2026-02-23T19:03:27.6331881Z Client: Docker Engine - Community
2026-02-23T19:03:27.6332353Z  Version:    28.0.4
2026-02-23T19:03:27.6332664Z  Context:    default
2026-02-23T19:03:27.6332953Z  Debug Mode: false
2026-02-23T19:03:27.6333230Z  Plugins:
2026-02-23T19:03:27.6333516Z   buildx: Docker Buildx (Docker Inc.)
2026-02-23T19:03:27.6333885Z     Version:  v0.31.1
2026-02-23T19:03:27.6334381Z     Path:     /usr/libexec/docker/cli-plugins/docker-buildx
2026-02-23T19:03:27.6334931Z   compose: Docker Compose (Docker Inc.)
2026-02-23T19:03:27.6335342Z     Version:  v2.38.2
2026-02-23T19:03:27.6335761Z     Path:     /usr/libexec/docker/cli-plugins/docker-compose
2026-02-23T19:03:27.6336140Z 
2026-02-23T19:03:27.6336251Z Server:
2026-02-23T19:03:27.6336518Z  Containers: 0
2026-02-23T19:03:27.6336802Z   Running: 0
2026-02-23T19:03:27.6337080Z   Paused: 0
2026-02-23T19:03:27.6337349Z   Stopped: 0
2026-02-23T19:03:27.6337625Z  Images: 1
2026-02-23T19:03:27.6337904Z  Server Version: 28.0.4
2026-02-23T19:03:27.6338245Z  Storage Driver: overlay2
2026-02-23T19:03:27.6338607Z   Backing Filesystem: extfs
2026-02-23T19:03:27.6339172Z   Supports d_type: true
2026-02-23T19:03:27.6339513Z   Using metacopy: false
2026-02-23T19:03:27.6339854Z   Native Overlay Diff: false
2026-02-23T19:03:27.6340209Z   userxattr: false
2026-02-23T19:03:27.6340527Z  Logging Driver: json-file
2026-02-23T19:03:27.6341296Z  Cgroup Driver: systemd
2026-02-23T19:03:27.6341643Z  Cgroup Version: 2
2026-02-23T19:03:27.6342116Z  Plugins:
2026-02-23T19:03:27.6342395Z   Volume: local
2026-02-23T19:03:27.6342768Z   Network: bridge host ipvlan macvlan null overlay
2026-02-23T19:03:27.6343417Z   Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
2026-02-23T19:03:27.6343976Z  Swarm: inactive
2026-02-23T19:03:27.6344312Z  Runtimes: io.containerd.runc.v2 runc
2026-02-23T19:03:27.6344716Z  Default Runtime: runc
2026-02-23T19:03:27.6345062Z  Init Binary: docker-init
2026-02-23T19:03:27.6345521Z  containerd version: dea7da592f5d1d2b7755e3a161be07f43fad8f75
2026-02-23T19:03:27.6346068Z  runc version: v1.3.4-0-gd6d73eb8
2026-02-23T19:03:27.6346472Z  init version: de40ad0
2026-02-23T19:03:27.6346805Z  Security Options:
2026-02-23T19:03:27.6347117Z   apparmor
2026-02-23T19:03:27.6347390Z   seccomp
2026-02-23T19:03:27.6347660Z    Profile: builtin
2026-02-23T19:03:27.6347967Z   cgroupns
2026-02-23T19:03:27.6348262Z  Kernel Version: 6.11.0-1018-azure
2026-02-23T19:03:27.6348868Z  Operating System: Ubuntu 24.04.3 LTS
2026-02-23T19:03:27.6349579Z  OSType: linux
2026-02-23T19:03:27.6349890Z  Architecture: x86_64
2026-02-23T19:03:27.6350226Z  CPUs: 4
2026-02-23T19:03:27.6350529Z  Total Memory: 15.62GiB
2026-02-23T19:03:27.6350876Z  Name: runnervmwffz4
2026-02-23T19:03:27.6351244Z  ID: 073c65d4-c458-42c9-935a-939d0489da0a
2026-02-23T19:03:27.6351696Z  Docker Root Dir: /var/lib/docker
2026-02-23T19:03:27.6352112Z  Debug Mode: false
2026-02-23T19:03:27.6352449Z  Username: controlw
2026-02-23T19:03:27.6352784Z  Experimental: false
2026-02-23T19:03:27.6353135Z  Insecure Registries:
2026-02-23T19:03:27.6358163Z   ::1/128
2026-02-23T19:03:27.6358474Z   127.0.0.0/8
2026-02-23T19:03:27.6359013Z  Live Restore Enabled: false
2026-02-23T19:03:27.6359290Z 
2026-02-23T19:03:27.6359907Z ##[endgroup]
2026-02-23T19:03:27.6360532Z ##[group]Proxy configuration
2026-02-23T19:03:27.6360985Z No proxy configuration found
2026-02-23T19:03:27.6361656Z ##[endgroup]
2026-02-23T19:03:27.7563959Z ##[group]Buildx version
2026-02-23T19:03:27.7586417Z [command]/usr/bin/docker buildx version
2026-02-23T19:03:27.8480350Z github.com/docker/buildx v0.31.1 a2675950d46b2cb171b23c2015ca44fb88607531
2026-02-23T19:03:27.8524076Z ##[endgroup]
2026-02-23T19:03:27.8524770Z ##[group]Builder info
2026-02-23T19:03:27.9969599Z {
2026-02-23T19:03:27.9969974Z   "nodes": [
2026-02-23T19:03:27.9970296Z     {
2026-02-23T19:03:27.9970592Z       "name": "default",
2026-02-23T19:03:27.9970959Z       "endpoint": "default",
2026-02-23T19:03:27.9971330Z       "status": "running",
2026-02-23T19:03:27.9971683Z       "buildkit": "v0.20.2",
2026-02-23T19:03:27.9972200Z       "platforms": "linux/amd64,linux/amd64/v2,linux/amd64/v3,linux/386",
2026-02-23T19:03:27.9972777Z       "features": {
2026-02-23T19:03:27.9973130Z         "Automatically load images to the Docker Engine image store": true,
2026-02-23T19:03:27.9973510Z         "Cache export": true,
2026-02-23T19:03:27.9973751Z         "Direct push": true,
2026-02-23T19:03:27.9973996Z         "Docker exporter": true,
2026-02-23T19:03:27.9974242Z         "Multi-platform build": true,
2026-02-23T19:03:27.9974497Z         "OCI exporter": true
2026-02-23T19:03:27.9974701Z       },
2026-02-23T19:03:27.9974866Z       "labels": {
2026-02-23T19:03:27.9975174Z         "org.mobyproject.buildkit.worker.moby.host-gateway-ip": "172.17.0.1"
2026-02-23T19:03:27.9975546Z       }
2026-02-23T19:03:27.9975698Z     }
2026-02-23T19:03:27.9975858Z   ],
2026-02-23T19:03:27.9976024Z   "name": "default",
2026-02-23T19:03:27.9976216Z   "driver": "docker"
2026-02-23T19:03:27.9976399Z }
2026-02-23T19:03:27.9976873Z ##[endgroup]
2026-02-23T19:03:28.1715774Z [command]/usr/bin/docker buildx build --build-arg MAJOR_VERSION=1 --build-arg MINOR_VERSION=0 --build-arg PATCH_VERSION=1 --iidfile /home/runner/work/_temp/docker-actions-toolkit-cTZObw/build-iidfile-09ad360a12.txt --label DEBUG_VERSION=1 --label .0 --label .1 --label DEBUG_MAJOR=1 --label DEBUG_MINOR=0 --label DEBUG_PATCH=1 --tag controlw/devops-info-service:1 --tag .0 --tag .1 --tag controlw/devops-info-service:latest --metadata-file /home/runner/work/_temp/docker-actions-toolkit-cTZObw/build-metadata-e50d5ec175.json --push .
2026-02-23T19:03:28.2979212Z ERROR: failed to build: invalid tag ".0": invalid reference format
2026-02-23T19:03:28.3021591Z ##[group]Reference
2026-02-23T19:03:28.3844924Z No build reference found
2026-02-23T19:03:28.3845677Z ##[endgroup]
2026-02-23T19:03:28.3846169Z ##[group]Check build summary support
2026-02-23T19:03:28.3850198Z Build summary requires a build reference
2026-02-23T19:03:28.3850945Z ##[endgroup]
2026-02-23T19:03:28.3877110Z ##[error]buildx failed with: ERROR: failed to build: invalid tag ".0": invalid reference format
2026-02-23T19:03:28.4023310Z Post job cleanup.
2026-02-23T19:03:28.6433565Z ##[group]Removing temp folder /home/runner/work/_temp/docker-actions-toolkit-cTZObw
2026-02-23T19:03:28.6442828Z ##[endgroup]
2026-02-23T19:03:28.6443830Z ##[group]Post cache
2026-02-23T19:03:28.6444860Z State not set
2026-02-23T19:03:28.6445655Z ##[endgroup]
2026-02-23T19:03:28.6613882Z Post job cleanup.
2026-02-23T19:03:28.9617175Z ##[group]Logout from docker.io
2026-02-23T19:03:28.9662412Z [command]/usr/bin/docker logout docker.io
2026-02-23T19:03:28.9828960Z Removing login credentials for docker.io
2026-02-23T19:03:28.9858819Z ##[endgroup]
2026-02-23T19:03:28.9859288Z ##[group]Post cache
2026-02-23T19:03:28.9861055Z State not set
2026-02-23T19:03:28.9861870Z ##[endgroup]
2026-02-23T19:03:29.0013193Z Post job cleanup.
2026-02-23T19:03:29.0961077Z [command]/usr/bin/git version
2026-02-23T19:03:29.1012884Z git version 2.52.0
2026-02-23T19:03:29.1073357Z Temporarily overriding HOME='/home/runner/work/_temp/a1382ddb-062e-4786-961f-24c45a9b2a68' before making global git config changes
2026-02-23T19:03:29.1074112Z Adding repository directory to the temporary git global config as a safe directory
2026-02-23T19:03:29.1078475Z [command]/usr/bin/git config --global --add safe.directory /home/runner/work/DevOps-Core-Course/DevOps-Core-Course
2026-02-23T19:03:29.1111416Z [command]/usr/bin/git config --local --name-only --get-regexp core\.sshCommand
2026-02-23T19:03:29.1143241Z [command]/usr/bin/git submodule foreach --recursive sh -c "git config --local --name-only --get-regexp 'core\.sshCommand' && git config --local --unset-all 'core.sshCommand' || :"
2026-02-23T19:03:29.1403618Z [command]/usr/bin/git config --local --name-only --get-regexp http\.https\:\/\/github\.com\/\.extraheader
2026-02-23T19:03:29.1424274Z http.https://github.com/.extraheader
2026-02-23T19:03:29.1436571Z [command]/usr/bin/git config --local --unset-all http.https://github.com/.extraheader
2026-02-23T19:03:29.1466294Z [command]/usr/bin/git submodule foreach --recursive sh -c "git config --local --name-only --get-regexp 'http\.https\:\/\/github\.com\/\.extraheader' && git config --local --unset-all 'http.https://github.com/.extraheader' || :"
2026-02-23T19:03:29.1683907Z [command]/usr/bin/git config --local --name-only --get-regexp ^includeIf\.gitdir:
2026-02-23T19:03:29.1714063Z [command]/usr/bin/git submodule foreach --recursive git config --local --show-origin --name-only --get-regexp remote.origin.url
2026-02-23T19:03:29.2041440Z Cleaning up orphan processes

### BuildKit logs

```text

```

### Additional info

This behavior seems to occur only when `tags`/`labels` are provided as multiline YAML scalars with expressions.

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Multiline `tags`/`labels` with version `1.0.1` are split into `1`, `.0`, `.1` in generated `docker buildx` command #1462

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Multiline tags/labels with version 1.0.1 are split into 1, .0, .1 in generated docker buildx command #1462

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I've found a bug, and:

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Multiline `tags`/`labels` with version `1.0.1` are split into `1`, `.0`, `.1` in generated `docker buildx` command #1462