name: Build and Push Docker Image

on:
  push:
    branches: [main]
  workflow_dispatch:

jobs:
  build:
    # Runs on the forgerunner host: bundled Docker CLI + mounted /var/run/docker.sock.
    runs-on: host
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: registry.alwisp.com
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Build and Push
        run: |
          # gitea.repository is already "owner/repo" (e.g. jason/breedr).
          IMAGE="registry.alwisp.com/${{ gitea.repository }}"
          docker build -t "${IMAGE}:latest" .
          docker push "${IMAGE}:latest"

      - name: Clean up build images on host
        # Builds use the host Docker daemon, so the built image and replaced
        # layers stay on the Unraid host unless removed. Drop our tag and prune
        # dangling layers to stop orphan images piling up on the array.
        if: always()
        run: |
          IMAGE="registry.alwisp.com/${{ gitea.repository }}"
          docker image rm -f "${IMAGE}:latest" 2>/dev/null || true
          docker image prune -f 2>/dev/null || true