build-docker-images.yml

name: Build and Push Docker Images

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

jobs:
  build_references_docker:
    runs-on: ubuntu-latest
    env:
      REGISTRY: ghcr.io
      IMAGE_NAME: sagebionetworks/genie-bpc-pipeline-references
      TAG: ${{ github.ref_name }}

    steps:
    - name: Checkout repository
      uses: actions/checkout@v3
      with:
        fetch-depth: 2

    - 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/references
      id: check_changes
      run: |
        # Check for a merge base, fallback to root commit if none exists
        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

        # Compare changes between DIFF_BASE and HEAD
        if git diff --name-only $DIFF_BASE -- scripts/references | 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/references
      if: env.CHANGED == 'true'
      uses: docker/build-push-action@v5
      with:
        context: scripts/references
        tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}