build.yml

name: Build and test Docker image

# Run builds on main commits and when PRs are opened or updated
on:
  push:
    branches:
      - main
  pull_request:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  TEST_TAG: ${{ github.repository }}:test

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          install: true # make buildx the default
      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          flavor: |
            latest=${{ github.ref == 'refs/heads/main' }}
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        if: github.ref == 'refs/heads/main'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build test environment Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          target: test
          tags: ${{ env.TEST_TAG }}
          load: true
          cache-from: type=gha
          cache-to: type=gha,mode=max # mode=max means cache intermediate images
          build-args: |
            CI=true
      - name: Enable problem matchers
        run: |
          echo "::add-matcher::${{ github.workspace }}/.github/problem-matchers/tsc.json"
          echo "::add-matcher::${{ github.workspace }}/.github/problem-matchers/eslint.json"
          echo "::add-matcher::${{ github.workspace }}/.github/problem-matchers/stylelint.json"
      - name: Run tests
        run: |
          docker run -e PATH_PREFIX=${{ github.workspace }} -e CI=true --rm ${{ env.TEST_TAG }}
      - name: Build production Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: ${{ github.ref == 'refs/heads/main' }} # only push on main builds
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max # mode=max means cache intermediate images
          build-args: |
            CI=true