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path: root/.github/workflows/docker.yaml
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name: upload to registry
# this is for uploading images to a container registry when
# changes are made to `main`

on:
  check_suite:
    types: [completed]
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        arch: [amd64, arm64v8]

    # https://github.com/sellout/bash-strict-mode/commit/9bf1d65c2f786a9887facfcb81e06d8b8b5f4667
    if: github.event.check_suite.app.name == 'Garnix CI'
      && github.event.check_suite.conclusion == 'success'
      && github.event.check_suite.latest_check_runs_count > 1
      && github.event.check_suite.head_branch == 'main'

    steps:
      - uses: actions/checkout@v4

      - name: install nix
        uses: DeterminateSystems/nix-installer-action@v7

      - uses: DeterminateSystems/magic-nix-cache-action@v2

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

      - name: upload image
        uses: actions/upload-artifact@v3
        with:
          name: container-${{ matrix.arch }}
          path: ${{ steps.build.outputs.path }}
          if-no-files-found: error
          retention-days: 1

  upload:
    needs: build
    runs-on: ubuntu-latest

    permissions:
      packages: write

    env:
      REGISTRY: ghcr.io
      USERNAME: getchoo

    # ditto
    if: github.event.check_suite.app.name == 'Garnix CI'
      && github.event.check_suite.conclusion == 'success'
      && github.event.check_suite.latest_check_runs_count > 1
      && github.event.check_suite.head_branch == 'main'

    steps:
      - name: set image name
        run: |
          echo "IMAGE_NAME=${GITHUB_REPOSITORY,,}" >> "$GITHUB_ENV"

      - uses: actions/checkout@v4

      - name: download images
        uses: actions/download-artifact@v3
        with:
          path: images

      - name: login to registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ env.USERNAME }}
          password: ${{ github.token }}

      - name: upload to registry
        env:
          TAG: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
        run: |
          set -eux

          architectures=("amd64" "arm64v8")
          for arch in "${architectures[@]}"; do
            docker load < images/container-"$arch"/*.tar.gz
            docker tag ${{ env.IMAGE_NAME }}:latest-"$arch" ${{ env.TAG }}-"$arch"
            docker push ${{ env.TAG }}-"$arch"
          done

          docker manifest create ${{ env.TAG }} \
            --amend ${{ env.TAG }}-amd64 \
            --amend ${{ env.TAG }}-arm64v8

          docker manifest push ${{ env.TAG }}