name: Build the Postgres image

on:
  workflow_dispatch

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}/pg

jobs:
  build:
    runs-on: ${{ matrix.runner }}
    permissions:
      packages: write

    strategy:
      fail-fast: false
      matrix:
        include:
          - arch: amd64
            platform: linux/amd64
            runner: ubuntu-latest
          - arch: arm64
            platform: linux/arm64
            runner: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          flavor: |
            suffix=-${{ matrix.arch }},onlatest=true
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          driver-opts: |
            image=moby/buildkit:latest
            network=host

      - name: Build & Push single platform
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile.pg
          platforms: ${{ matrix.platform }}
          push: true
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Export digest
        run: echo "${{ steps.build.outputs.digest }}" > /tmp/digest-${{ matrix.arch }}

      - name: Upload digest artifact
        uses: actions/upload-artifact@v4
        with:
          name: digest-${{ matrix.arch }}
          path: /tmp/digest-${{ matrix.arch }}
          if-no-files-found: error

  create-manifest:
    needs: build
    if: github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    permissions:
      packages: write

    steps:
      - uses: actions/checkout@v4

      - name: Login GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Download all digests
        uses: actions/download-artifact@v4
        with:
          pattern: digest-*
          path: digests
          merge-multiple: true

      - name: Create multi-arch manifest
        run: |
          docker buildx imagetools create \
            --tag ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest \
            --tag ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }} \
            $(cat digests/digest-amd64) \
            $(cat digests/digest-arm64)