build-docker-images.yml

name: Build and Push Docker Images

on:
  push:
    branches: [develop, 'GEN*', 'gen*']
    paths:
      - 'scripts/**'
      - '.github/workflows/build-docker-images.yml'
  workflow_dispatch:

jobs:
  build_references_docker:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        module: ["references", "table_updates", "uploads"] # Define the modules you want to loop through for builds
    env:
      REGISTRY: ghcr.io
      IMAGE_NAME: sage-bionetworks/genie-bpc-pipeline
    permissions:
      contents: read
      packages: write

    steps:
    - name: Checkout repository
      uses: actions/checkout@v3
      with:
        fetch-depth: 2
        
    - name: Setup Docker buildx
      uses: docker/setup-buildx-action@v3

    - name: Fetch the default branch (develop) for comparison
      run: git fetch origin develop:refs/remotes/origin/develop --depth=1

    - name: Check for Changes in scripts/${{ matrix.module }}
      id: check_changes
      run: |
        # Determine the correct DIFF_BASE
        if [ "${{ github.ref_name }}" = "develop" ]; then
          # On the develop branch, compare with the previous commit (HEAD^)
          DIFF_BASE="HEAD^"
        else
          # On feature branches, compare with origin/develop
          if git merge-base --is-ancestor origin/develop HEAD; then
            DIFF_BASE="origin/develop"
          else
            DIFF_BASE=$(git rev-list --max-parents=0 HEAD)  # Use the initial commit as fallback
          fi
        fi

        # Compare changes between DIFF_BASE and HEAD
        if git diff --name-only $DIFF_BASE -- scripts/${{ matrix.module }} | grep -q .; then
          echo "CHANGED=true" >> $GITHUB_ENV
        else
          echo "CHANGED=false" >> $GITHUB_ENV
        fi

    - name: Log in to GitHub Container Registry
      if: env.CHANGED == 'true'
      uses: docker/login-action@v3
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build and Push Docker Image for scripts/${{ matrix.module }}
      if: env.CHANGED == 'true'
      uses: docker/build-push-action@v5
      with:
        context: scripts/${{ matrix.module }}
        push: true
        tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.module }}-${{ github.ref_name }}
        cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.module }}-${{ github.ref_name }}-cache
        cache-to: type=inline,mode=max