container.yml

name: build & push docker container
on:
  push:
    tags:
      - '*'
  pull_request:
    branches:
      - main
jobs:
  docker:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        context: 
          - frontend
          - backend
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Docker meta
        id: metal
        uses: docker/metadata-action@v5
        with:
          images: |
            ghcr.io/${{ github.repository }}-${{ matrix.context }}
      - name: Load commit sha (short) into environment
        run: |
            COMMIT_HASH=$(git rev-parse --short HEAD)
            echo "COMMIT_HASH=$COMMIT_HASH" >> $GITHUB_ENV
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Login to GitHub Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ github.token }}
      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: ./${{ matrix.context }}
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.metal.outputs.tags }}
          labels: ${{ steps.metal.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          build-args: COMMIT_HASH=${{ env.COMMIT_HASH }}