docker-publish-alpine.yml

name: Docker alpine FFmpeg 5.1.2 and SRT 
#
on:
  push:
    branches: 
      - main
    tags:
      - '*'
#
jobs:
  docker-ffmpeg-srt:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      # Checkout the repository to the GitHub Actions runner
      - name: Checkout
        uses: actions/checkout@v3

      # Repo metadata
      - name: Repo metadata
        id: repo
        uses: actions/github-script@v4
        with:
          script: |
            const repo = await github.repos.get(context.repo)
            return repo.data
      # Prepare variables
      - name: Prepare
        id: prep
        run: |
          REG=ghcr.io
          IMAGE=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')
          DOCKER_IMAGE=${REG}/${IMAGE}-busybox
          VERSION=nool
          if [ "${{ github.event_name }}" = "schedule" ]; then
            VERSION=nightly
          elif [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION=${GITHUB_REF#refs/tags/}
          elif [[ $GITHUB_REF == refs/heads/* ]]; then
            VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
            if [ "${{ github.event.repository.default_branch }}" = "$VERSION" ]; then
              VERSION=latest
            fi
          elif [[ $GITHUB_REF == refs/pull/* ]]; then
            VERSION=pr-${{ github.event.number }}
          fi
          TAGS="${DOCKER_IMAGE}:${VERSION}"
          if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
            MINOR=${VERSION%.*}
            MAJOR=${MINOR%.*}
            TAGS="$TAGS,${DOCKER_IMAGE}:${MINOR},${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:latest"
          fi
          echo ::set-output name=version::${VERSION}
          echo ::set-output name=tags::${TAGS}
          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
      # Set up Buildx env
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      # Login
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Build image and push to registry
      - name: Build and push
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./Dockerfile.busybox
          platforms: linux/amd64
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.title=${{ fromJson(steps.repo.outputs.result).name }}
            org.opencontainers.image.description=${{ fromJson(steps.repo.outputs.result).description }}
            org.opencontainers.image.url=${{ fromJson(steps.repo.outputs.result).html_url }}
            org.opencontainers.image.source=${{ fromJson(steps.repo.outputs.result).html_url }}
            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.licenses=${{ fromJson(steps.repo.outputs.result).license.spdx_id }}