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

permissions:
  packages: write

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' }}
      RAW_REF_NAME: ${{ github.event.pull_request.head.ref || github.ref }}

    steps:
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v3.0.0

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/checkout@v4
        with:
          submodules: recursive

      # Needed for buildx gha cache to work
      - name: Expose GitHub Runtime
        uses: crazy-max/ghaction-github-runtime@v3

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

          docker buildx build \
            --platform "$BUILD_PLATFORMS" \
            --tag "$CONTAINER_NAME:$CONTAINER_TAG" \
            --label "org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}" \
            --label "org.opencontainers.image.documentation=${{ github.server_url }}/${{ github.repository }}" \
            --label "org.opencontainers.image.url=${{ github.server_url }}/${{ github.repository }}/packages" \
            --label "org.opencontainers.image.ref.name=$REF_NAME" \
            --label "org.opencontainers.image.revision=${{ github.sha }}" \
            --label "org.opencontainers.image.vendor=${{ github.repository_owner }}" \
            --label "org.opencontainers.image.created=$(date -u --rfc-3339=seconds)" \
            --cache-from type=gha \
            --cache-to type=gha,mode=max \
            --pull ${{ github.event_name == 'push' && '--push' || '' }} .