build.yml

name: Wattsi CI
on:
  pull_request:
    branches: ['main']
  push:
    branches: ['main']

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

jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
    - name: Checkout
      uses: actions/checkout@v4
      with:
        fetch-depth: 0
    - name: Setup QEMU
      uses: docker/setup-qemu-action@v3
      with:
        platforms: linux/amd64,linux/arm64
    - name: Setup Docker Buildx
      uses: docker/setup-buildx-action@v3
    - name: Create version file
      run: |
        git rev-list --count HEAD > src/version.inc
    - name: Build
      uses: docker/build-push-action@v5
      with:
        context: .
        load: true
        tags: ${{ env.IMAGE_NAME }}:test
    - name: Test
      # This minimal test also saves the version for us to use as a tag.
      run: |
        WATTSI_VERSION=$(docker run "$IMAGE_NAME:test" --version | cut -d' ' -f2)
        echo "WATTSI_VERSION=$WATTSI_VERSION" >> $GITHUB_ENV
    - name: Login
      if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
      uses: docker/login-action@v3
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    - name: Build and push
      if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
      uses: docker/build-push-action@v5
      with:
        context: .
        push: true
        platforms: linux/amd64,linux/arm64
        tags: |
          ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.WATTSI_VERSION }}
          ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest