name: Build container
on:
  push:
    branches:
      - master
  pull_request:

  # Allow for manually running
  workflow_dispatch:
    inputs:
      container_tag:
        description: Tag for container
        default: "latest"
        required: true

jobs:
  container:
    runs-on: ubuntu-20.04
    env:
      CONTAINER_NAME: ghcr.io/${{ github.repository }}
      BUILD_PLATFORMS: linux/amd64,linux/arm,linux/arm64,linux/ppc64le,linux/s390x
      RAW_CONTAINER_TAG: ${{ github.event.inputs.container_tag || github.event.pull_request.head.ref || 'latest' }}

    steps:
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v2.0.0

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/checkout@v3
        with:
          submodules: recursive

      # Needed for buildx gha cache to work
      - name: Expose GitHub Runtime
        uses: crazy-max/ghaction-github-runtime@v2

      - name: Build container
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          CONTAINER_TAG=$(echo "$RAW_CONTAINER_TAG" | sed 's/[^a-zA-Z0-9]\+/-/')

          docker buildx build \
            --platform "$BUILD_PLATFORMS" \
            --tag "$CONTAINER_NAME:$CONTAINER_TAG" \
            --cache-from type=gha \
            --cache-to type=gha,mode=max \
            --pull --push .