name: Build Docker CI Images
on:
  workflow_dispatch:
    inputs:
      distros:
        description: "List distros to build (space separated)"
        type: string
        default: "ALL"
  push:
    paths:
      - "docker/Dockerfile.*"
      - "docker/*.sh"

jobs:
  detect-changes:
    runs-on: ubuntu-latest
    env:
      BUILD_DOCKER_MANUAL_ENV: ${{ inputs.distros || '' }}
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0 # Needed for detecting changes

      - name: Set build matrix
        id: set-matrix
        run: .github/scripts/get-changed-dockerfiles.sh >> $GITHUB_OUTPUT

  build-and-push:
    needs: detect-changes
    if: ${{ needs.detect-changes.outputs.matrix != '[]' }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false # Don't cancel other distros if this one fails
      matrix:
        distro: ${{ fromJson(needs.detect-changes.outputs.matrix) }}
    permissions:
      packages: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6

      - name: Login to GHCR
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: docker
          file: ./docker/Dockerfile.${{ matrix.distro }}
          push: true
          tags: ghcr.io/${{ github.repository }}/ci-build-${{ matrix.distro }}:latest

      - name: Cleanup old builds
        uses: actions/delete-package-versions@v5
        with:
          package-name: libx52/ci-build-${{ matrix.distro }}
          package-type: container
          delete-only-untagged-versions: true