docker.yml

name: Create and publish Docker images

on:
  push: { branches: [ 3.3.x ] }
  pull_request:
    branches: [ 3.3.x ]
    paths: ['Docker/**']
  workflow_call:
  workflow_dispatch:

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    strategy:
      fail-fast: false
      matrix:
        include:
        - name: github_ci
        - name: openmpi

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

      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to the Container registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository }}_${{ matrix.name }}

      - name: Build and cache base Docker image
        uses: docker/build-push-action@v5
        with:
          context: ./Docker
          file: ./Docker/${{ matrix.name }}_dockerfile
          build-args: |
            NCORES=2
          target: base
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=${{ github.ref_name }}-${{ matrix.name }}
          cache-to: type=gha,mode=max,scope=${{ github.ref_name }}-${{ matrix.name }}

      - name: Build and push final Docker image
        uses: docker/build-push-action@v5
        with:
          context: ./Docker
          file: ./Docker/${{ matrix.name }}_dockerfile
          build-args: |
            NCORES=2
          # cache pkgs layer in dockerfile
          no-cache-filters: pkgs
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}