release.yml

name: Release

on:
    push:
        tags:
        # run only against tags that follow semver (https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string)
        - 'v[0-9]+.[0-9]+.[0-9]+*'

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

permissions:
  contents: write
  packages: write

env:
  REGISTRY: ghcr.io
  REGISTRY_IMAGE: ghcr.io/${{ github.repository }}
  REGEX_IMAGE: ${{ github.repository }}:\\d+.\\d+.\\d+

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    outputs:
      IMAGE_NAME: ${{ steps.image_builder.outputs.IMAGE }}
      TAGS: ${{ steps.meta.outputs.tags }}
      VERSION: ${{ steps.meta.outputs.version }}
    steps:
      - name: validate tag
        run: echo ${{ github.ref_name }} | grep -qE '^v[0-9]+\.[0-9]+\.[0-9]+(-rc\.[0-9]+)?$'

      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Checkout
        uses: actions/checkout@v4

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}

      - name: Image name builder
        id: image_builder
        run: |
          IMAGE=$(jq -ecr '.tags | map(select(match("${{ env.REGEX_IMAGE }}", "i"))) | first| sub(":.*$";"")' <<< "$DOCKER_METADATA_OUTPUT_JSON")
          echo "IMAGE=$IMAGE" >> $GITHUB_OUTPUT

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

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

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

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          push: false
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          outputs: type=image,name=${{ steps.image_builder.outputs.IMAGE }},push-by-digest=true,push=true

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    needs:
      - build
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

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

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cRr 'split("\n") | map(gsub("\\s+";"")) | map("-t "+ .) | join(" ")' <<< '${{ needs.build.outputs.TAGS }}') \
            $(printf '${{ needs.build.outputs.IMAGE_NAME }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ needs.build.outputs.IMAGE_NAME }}:${{ needs.build.outputs.VERSION }}