docker-build.yml

name: Build and Push Docker Image

on:
  push:
    branches:
      - main
    tags:
      - 'v*'
  workflow_dispatch:

permissions:
  contents: read
  packages: write

jobs:
  pre-check:
    runs-on: ubuntu-latest
    outputs:
      should_build: ${{ steps.check.outputs.should_build }}
    steps:
      - uses: actions/checkout@v4
        if: github.event_name == 'push' && startsWith(github.ref, 'refs/heads/')
        with:
          fetch-depth: 0
      - name: Check if commit has release tag
        id: check
        run: |
          if [[ "${{ github.event_name }}" == "push" && "${{ github.ref }}" == refs/heads/* ]] && git tag --points-at HEAD | grep -q '^v'; then
            echo "should_build=false" >> $GITHUB_OUTPUT
            echo "::notice::Skipping beta build: commit already has a release tag"
          else
            echo "should_build=true" >> $GITHUB_OUTPUT
          fi

  build:
    needs: pre-check
    if: needs.pre-check.outputs.should_build == 'true'
    runs-on: ${{ matrix.runner }}
    outputs:
      version: ${{ steps.version.outputs.version }}
      is_beta: ${{ steps.version.outputs.is_beta }}

    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
            arch: amd64
          - platform: linux/arm64
            runner: ubuntu-22.04-arm
            arch: arm64

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

      - name: Determine version
        id: version
        run: |
          if [[ "${{ github.ref }}" == refs/tags/* ]]; then
            echo "version=${{ github.ref_name }}" >> $GITHUB_OUTPUT
            echo "is_beta=false" >> $GITHUB_OUTPUT
          else
            SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-6)
            echo "version=beta-${SHORT_SHA}" >> $GITHUB_OUTPUT
            echo "is_beta=true" >> $GITHUB_OUTPUT
          fi

      - name: Write VERSION file
        run: echo "${{ steps.version.outputs.version }}" > VERSION

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ github.token }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.platform }}
          push: true
          provenance: false
          cache-from: type=gha,scope=build-${{ matrix.arch }}
          cache-to: type=gha,scope=build-${{ matrix.arch }},mode=max
          tags: ghcr.io/${{ github.repository_owner }}/longjin-api:${{ steps.version.outputs.version }}-${{ matrix.arch }}
          labels: |
            org.opencontainers.image.source=https://github.com/${{ github.repository }}

  manifest:
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ github.token }}

      - name: Create and push multi-arch manifest
        run: |
          VERSION="${{ needs.build.outputs.version }}"
          IS_BETA="${{ needs.build.outputs.is_beta }}"
          IMAGE="ghcr.io/${{ github.repository_owner }}/longjin-api"

          docker manifest create ${IMAGE}:${VERSION} \
            ${IMAGE}:${VERSION}-amd64 \
            ${IMAGE}:${VERSION}-arm64
          docker manifest push ${IMAGE}:${VERSION}

          if [ "${IS_BETA}" = "true" ]; then
            ALIAS="beta"
          else
            ALIAS="latest"
          fi
          docker manifest create ${IMAGE}:${ALIAS} \
            ${IMAGE}:${VERSION}-amd64 \
            ${IMAGE}:${VERSION}-arm64
          docker manifest push ${IMAGE}:${ALIAS}