name: Build and Push Docker Images (Multi-Arch)

on:
  push:
    branches: [main]
    tags: ['v*']
  pull_request:

env:
  REGISTRY: ghcr.io
  IMAGE: ${{ github.repository }}

jobs:
  build:
    name: Build ${{ matrix.arch }}
    runs-on: ${{ matrix.runner }}
    strategy:
      matrix:
        include:
          - arch: amd64
            platform: linux/amd64
            runner: ubuntu-latest
          - arch: arm64
            platform: linux/arm64
            runner: ubuntu-24.04-arm

    permissions:
      contents: read
      packages: write

    services:
      redis:
        image: redis:7-alpine
        ports: ['6379:6379']

    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        if: github.event_name != 'pull_request'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/build-push-action@v5
        with:
          context: .
          platforms: ${{ matrix.platform }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ matrix.arch }}-${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  manifest:
    name: Create and Push Manifest
    runs-on: ubuntu-latest
    needs: build
    if: github.event_name != 'pull_request'

    permissions:
      contents: write
      packages: write

    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Create and push manifest
        run: |
          docker manifest create ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest \
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:amd64-${{ github.sha }} \
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:arm64-${{ github.sha }}

          docker manifest create ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ github.sha }} \
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:amd64-${{ github.sha }} \
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:arm64-${{ github.sha }}

          docker manifest push ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
          docker manifest push ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ github.sha }}