ci.yml

name: Build & Publish Docker Image

on:
  push:
    branches: [ main ]

permissions:
  contents: read
  packages: write

jobs:
  build-and-push:
    runs-on: ubuntu-latest

    steps:
      # 1. Checkout the repo
      - name: Checkout code
        uses: actions/checkout@v4

      # 2. Enable QEMU for cross‑platform
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      # 3. Enable Buildx
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      # 4. Log in to GitHub Container Registry
      - name: Log in to GHCR
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # 5. Build & push multi‑arch image
      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          file: Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/rendiff:latest
            ghcr.io/${{ github.repository_owner }}/rendiff:${{ github.sha }}