name: Build and Publish Runner Image
on:
  push:
    branches:
      - main
  schedule:
    # Run at 03:00 every Sunday to keep the base image fresh
    - cron: '0 3 * * 0'

env:
  # Adjust this if your Gitea domain is different
  REGISTRY: gitlab.julian-mutter.de 
  # This automatically evaluates to your user/repo name (e.g., julian/nix-ci-runner)
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    # We use the standard ubuntu-latest to build our custom runner
    runs-on: ubuntu-latest 
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      # Gitea Actions automatically provides a token that can push to its own registry
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.CONTAINER_REGISTRY_GITEA_USERNAME }}
          password: ${{ secrets.CONTAINER_REGISTRY_GITEA_PASSWORD }}

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

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest