docker.yml

name: Docker Build & Publish

on:
  push:
    branches: [ "main" ]
    # Also trigger on semver tags, e.g., v1.0.0, v2.1.3
    tags: [ 'v*.*.*' ]
  pull_request:
    branches: [ "main" ]

env:
  REGISTRY: ghcr.io
  # This sets the image name to ghcr.io/YOUR_GITHUB_USERNAME/dolfinx-serial
  IMAGE_NAME: ${{ github.repository_owner }}/dolfinx-serial

jobs:
  build-test-push:
    name: Build, Test, and Push
    runs-on: ubuntu-24.04
    
    # We need 'packages: write' permission to push the image to GitHub Packages
    permissions:
      contents: read
      packages: write

    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Set up QEMU (for ARM64 build)
      uses: docker/setup-qemu-action@v3

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3

    - name: Log in to the Container registry
      # Only log in if this is a push to main or a tag (skip for PRs)
      if: github.event_name != 'pull_request'
      uses: docker/login-action@v3
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
        tags: |
          # Output 'main' or 'latest' on push to main
          type=ref,event=branch
          type=edge,branch=main
          # Output '1.2.3' if you push a tag 'v1.2.3'
          type=semver,pattern={{version}}
          type=semver,pattern={{major}}.{{minor}}
          # Output PR number on pull requests
          type=ref,event=pr

    # --- Phase 1: Test ---
    # We build a local AMD64 image because multi-arch images cannot be loaded locally.
    - name: Build local image for verification
      uses: docker/build-push-action@v5
      with:
        context: .
        file: ./Dockerfile
        platforms: linux/amd64
        load: true
        tags: local-test-image:latest
        cache-from: type=gha
        cache-to: type=gha,mode=max

    - name: Verify DOLFINx Import
      run: |
        docker run --rm local-test-image:latest python3 -c "import dolfinx; print(f'SUCCESS! DOLFINx imported cleanly. Version: {dolfinx.__version__}')"

    - name: Run DOLFINx C++ Tests
      run: |
        docker run --rm local-test-image:latest bash -c "\
          cd /dolfinx/cpp/test && \
          rm -rf build && \
          cmake -B build -S . -DCMAKE_BUILD_TYPE=Developer -GNinja -DCMAKE_C_COMPILER=mpicc -DCMAKE_CXX_COMPILER=mpicxx && \
          cmake --build build -j 4 && \
          cd build && \
          ctest -VV --output-on-failure -R unittests_np_1"

    - name: Run DOLFINx Python Tests
      run: |
        docker run --rm local-test-image:latest bash -c "\
            python3 -m pip install pytest scipy && \
            cd /dolfinx/python/test && \
            python3 -m pytest -vs"