deploy-image.yml

name: Deploy Images to GHCR

on:
  push:
    branches:
      - main
    paths:
      - apps/api/**
      - .github/workflows/deploy-image.yml
      - .github/scripts/resolve_api_image_version.py
  workflow_dispatch:
    inputs:
      bump:
        description: Version bump to apply when publishing a new deploy tag
        required: false
        default: patch
        type: choice
        options:
          - patch
          - minor

permissions:
  contents: write
  packages: write

concurrency:
  group: api-image-release
  cancel-in-progress: false

jobs:
  version:
    runs-on: blacksmith-2vcpu-ubuntu-2404
    outputs:
      version: ${{ steps.version.outputs.version }}
      tag: ${{ steps.version.outputs.tag }}
      tag_exists: ${{ steps.version.outputs.tag_exists }}
      major: ${{ steps.version.outputs.major }}
      minor: ${{ steps.version.outputs.minor }}
      major_minor: ${{ steps.version.outputs.major_minor }}
      short_sha: ${{ steps.version.outputs.short_sha }}
      image: ${{ steps.version.outputs.image }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Ensure main ref
        run: |
          if [ "${GITHUB_REF}" != "refs/heads/main" ]; then
            echo "::error::API image releases must run from refs/heads/main, got ${GITHUB_REF}"
            exit 1
          fi

      - name: Fetch tags
        run: git fetch --force --tags origin

      - name: Resolve image version
        id: version
        env:
          BUMP: ${{ github.event.inputs.bump || 'patch' }}
        run: python .github/scripts/resolve_api_image_version.py --bump "${BUMP}" --sha "${GITHUB_SHA}"

  build:
    needs: version
    runs-on: ${{ matrix.runner }}
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            platform_suffix: linux-amd64
            runner: blacksmith-4vcpu-ubuntu-2404
          - platform: linux/arm64
            platform_suffix: linux-arm64
            runner: blacksmith-4vcpu-ubuntu-2404-arm
    defaults:
      run:
        working-directory: './apps/api'
    steps:
      - name: 'Checkout GitHub Action'
        uses: actions/checkout@main

      - name: Setup Blacksmith Builder
        uses: useblacksmith/setup-docker-builder@ef12d5b165b596e3aa44ea8198d8fde563eab402 # v1

      - name: 'Login to GitHub Container Registry'
        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
        with:
          registry: ghcr.io
          username: ${{github.actor}}
          password: ${{secrets.GITHUB_TOKEN}}

      - name: 'Build and Push Image'
        uses: useblacksmith/build-push-action@30c71162f16ea2c27c3e21523255d209b8b538c1 # v2
        with:
          context: ./apps/api
          push: true
          tags: ${{ needs.version.outputs.image }}:sha-${{ needs.version.outputs.short_sha }}-${{ matrix.platform_suffix }}
          platforms: ${{ matrix.platform }}
          provenance: false

  publish:
    runs-on: blacksmith-2vcpu-ubuntu-2404
    needs:
      - version
      - build
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: 'Login to GitHub Container Registry'
        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
        with:
          registry: ghcr.io
          username: ${{github.actor}}
          password: ${{secrets.GITHUB_TOKEN}}

      - name: Create Git tag
        env:
          RELEASE_TAG: ${{ needs.version.outputs.tag }}
        run: |
          git fetch --force --tags origin

          if git rev-parse -q --verify "refs/tags/${RELEASE_TAG}" >/dev/null; then
            tag_commit="$(git rev-list -n 1 "${RELEASE_TAG}")"
            if [ "${tag_commit}" != "${GITHUB_SHA}" ]; then
              echo "::error::${RELEASE_TAG} already points at ${tag_commit}, not ${GITHUB_SHA}"
              exit 1
            fi

            echo "${RELEASE_TAG} already exists on this commit; reusing it."
            exit 0
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag -a "${RELEASE_TAG}" "${GITHUB_SHA}" -m "Release API image ${RELEASE_TAG}"
          git push origin "${RELEASE_TAG}"

      - name: 'Create and Push Multi-Arch Manifest'
        env:
          IMAGE: ${{ needs.version.outputs.image }}
          VERSION: ${{ needs.version.outputs.version }}
          MAJOR: ${{ needs.version.outputs.major }}
          MAJOR_MINOR: ${{ needs.version.outputs.major_minor }}
          SHORT_SHA: ${{ needs.version.outputs.short_sha }}
        run: |
          amd64_image="${IMAGE}:sha-${SHORT_SHA}-linux-amd64"
          arm64_image="${IMAGE}:sha-${SHORT_SHA}-linux-arm64"
          manifest_tags=(
            "${IMAGE}:${VERSION}"
            "${IMAGE}:${VERSION}-production"
            "${IMAGE}:${MAJOR_MINOR}"
            "${IMAGE}:${MAJOR}"
            "${IMAGE}:latest"
          )

          for target in "${manifest_tags[@]}"; do
            docker manifest rm "${target}" >/dev/null 2>&1 || true
            docker manifest create "${target}" "${amd64_image}" "${arm64_image}"
            docker manifest push "${target}"
          done