docker-standalone.yml

name: Publish standalone Docker image

on:
  workflow_run:
    workflows: ["Publish to npm"]
    types: [completed]
    branches: [master]

jobs:
  check:
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    permissions:
      packages: read
    outputs:
      should_publish: ${{ steps.check.outputs.should_publish }}
      version: ${{ steps.check.outputs.version }}
      is_prerelease: ${{ steps.check.outputs.is_prerelease }}
    steps:
      - uses: actions/checkout@v5
      - name: Check if image already published
        id: check
        run: |
          VERSION=$(node -p "require('./package.json').version")
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          if [[ "$VERSION" == *-* ]]; then
            echo "is_prerelease=true" >> "$GITHUB_OUTPUT"
          else
            echo "is_prerelease=false" >> "$GITHUB_OUTPUT"
          fi
          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
          if docker manifest inspect "ghcr.io/${{ github.repository }}/standalone:$VERSION" > /dev/null 2>&1; then
            echo "should_publish=false" >> "$GITHUB_OUTPUT"
            echo "Image $VERSION already exists, skipping."
          else
            echo "should_publish=true" >> "$GITHUB_OUTPUT"
            echo "New version detected: $VERSION"
          fi

  publish:
    needs: check
    if: needs.check.outputs.should_publish == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v5
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: docker-standalone/Dockerfile
          push: true
          tags: |
            ghcr.io/${{ github.repository }}/standalone:${{ needs.check.outputs.version }}
            ${{ needs.check.outputs.is_prerelease == 'false' && format('ghcr.io/{0}/standalone:latest', github.repository) || '' }}