# CI Image Builder Workflow
# Automatically builds and pushes CI images when dependencies change
# Uses GitHub Container Registry (GHCR) or any container registry

name: CI Image Builder

on:
  push:
    branches:
      - main
    paths:
      - 'package.json'
      - 'package-lock.json'
      - 'Dockerfile.ci'
      - '.gitea/workflows/ci-image-builder.yml'
  workflow_dispatch:
    inputs:
      force_rebuild:
        description: 'Force rebuild even if no changes detected'
        required: false
        default: 'false'
        type: boolean

env:
  # Use GHCR or your own registry
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}/ci-runner

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

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

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha,prefix={{branch}}-
            type=ref,event=branch
            type=ref,event=pr
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push CI image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: Dockerfile.ci
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Update workflow documentation
        run: |
          echo "CI Image built and pushed successfully!"
          echo ""
          echo "Available tags:"
          echo "  - ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest"
          echo "  - ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}"
          echo ""
          echo "To use in workflows:"
          echo "  container:"
          echo "    image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest"