build-container.yml

name: Build container image

on:
  push:
    branches:
      - master
    tags:
      - '*'  # This triggers the action on all tag pushes

jobs:
  publish-docker-image:
    if: github.repository_owner == 'gbdev'
    runs-on: ubuntu-latest
    permissions:
      # So that the workflow can write to the ghcr an upload there
      packages: write
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
        
      - name: Build and push the master container image
        # When a commit is pushed to master
        if: github.ref == 'refs/heads/master'
        run: |
          COMMIT_HASH=$(git rev-parse --short HEAD)
          sed -i "2i LABEL org.opencontainers.image.description=\"RGBDS container image, containing the git version master:$COMMIT_HASH\"" Dockerfile
          docker build . --tag ghcr.io/gbdev/rgbds:master
          docker push ghcr.io/gbdev/rgbds:master
        
      - name: Build and push the version-tagged container image
        # When a tag is pushed
        if: startsWith(github.ref, 'refs/tags/')
        run: |
          TAG_NAME=${GITHUB_REF#refs/tags/}
          sed -i "2i LABEL org.opencontainers.image.description=\"RGBDS container image for the release version $TAG_NAME\"" Dockerfile
          docker build . --tag ghcr.io/gbdev/rgbds:$TAG_NAME
          docker push ghcr.io/gbdev/rgbds:$TAG_NAME