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name: Publish Docker Image

on:
  push:
    branches: [main]
  pull_request:

jobs:
  build:
    name: Build image
    runs-on: ubuntu-latest

    strategy:
      matrix:
        arch: [x86_64, aarch64]

    permissions:
      contents: read

    steps:
      - uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v12

      - name: Setup Nix cache
        uses: DeterminateSystems/magic-nix-cache-action@v6

      - name: Build Docker image
        id: build
        run: |
          nix build -L .#container-${{ matrix.arch }}
          [ ! -L result ] && exit 1
          echo "path=$(realpath result)" >> "$GITHUB_OUTPUT"

      - name: Upload image
        uses: actions/upload-artifact@v4
        with:
          name: container-${{ matrix.arch }}
          path: ${{ steps.build.outputs.path }}
          if-no-files-found: error
          retention-days: 12

  push:
    name: Push image
    runs-on: ubuntu-latest
    needs: build

    permissions:
      contents: read
      packages: write

    if: github.event_name == 'push'

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

      - name: Download images
        uses: actions/download-artifact@v4
        with:
          path: images

      - name: Login to registry
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_TOKEN }}

      - name: Push to registry
        env:
          TAG: docker.io/getchoo/packwiz-serve:latest
        run: |
          set -euo pipefail

          architectures=("x86_64" "aarch64")
          for arch in "${architectures[@]}"; do
            docker load < images/container-"$arch"/*.tar.gz
            docker tag packwiz-serve:latest-"$arch" ${{ env.TAG }}-"$arch"
            docker push ${{ env.TAG }}-"$arch"
          done

          docker manifest create ${{ env.TAG }} \
            --amend ${{ env.TAG }}-x86_64 \
            --amend ${{ env.TAG }}-aarch64

          docker manifest push ${{ env.TAG }}