nf-core_modules/.github/workflows/docker.yml

name: Build Docker Images
on:
  push:
    # Only on pushes to master (after PRs are merged)
    branches: master
    # Only if a conda environment file or a docker build file has been updated
    paths:
      - tools/*/environment.yml
      - tools/*/Dockerfile

jobs:
  build_docker:
    runs-on: ubuntu-latest
    steps:

      # Check out the repo
      - uses: actions/checkout@v1

      # Find the tool wrappers that changed
      # Annoyingly, matrix can't take dynamic variables
      - name: Find changed tools
        run: |
          TOOLS=$( git diff --name-only HEAD~ | egrep -o 'tools\/[^\/]+\/' | sort | uniq | awk NF | tr '\r\n' ' ' )
          # Save so that GitHub Actions can see this variable in the next step
          echo "::set-env name=TOOLS::$TOOLS"
          echo "Tools that appear to have been updated:"
          echo $TOOLS          


      - name: Build images
        run: |
          echo "Tools that appear to have been updated:"
          echo -e $TOOLS
          echo '-----'
          for TOOL in $TOOLS; do
            echo $TOOL
          done;
          echo '-----'
          for d in tools/*; do
            for TOOL in $TOOLS; do
              echo "$d -- $TOOL"
              if echo $d/ | grep -q "$TOOL"; then
                cd "$GITHUB_WORKSPACE/$d"
                TOOLNAME=$(basename `pwd`)
                # IMGNAME=docker.pkg.github.com/${GITHUB_REPOSITORY,,}/${TOOLNAME,,}:$GITHUB_SHA
                # TODO: How do we have a proper version tag here?
                IMGNAME=docker.pkg.github.com/${GITHUB_REPOSITORY,,}/${TOOLNAME,,}:latest
                echo "Image name is: $IMGNAME"
                echo "${{ secrets.GITHUB_TOKEN }}" | docker login -u ${{ github.actor }} --password-stdin docker.pkg.github.com
                docker build -t $IMGNAME  .
                docker push $IMGNAME
              fi;
            done;
          done;