build.yml

name: build

on:
  workflow_dispatch:
  pull_request:
    branches:
      - main
  push:
    tags:
      - 'v[0-9]+\.[0-9]+\.[0-9]+'
      - 'v[0-9]+\.[0-9]+\.[0-9]+-rc[0-9]+'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  id-token: write
  contents: read
  packages: write

jobs:
  build:
    name: "Build Images"
    strategy:
      fail-fast: false
      matrix:
        runner:
          - selector: burnt-labs-amd64
            platform: linux/amd64
          - selector: burnt-labs-arm64
            platform: linux/arm64
    runs-on: ${{ matrix.runner.selector }}

    steps:
      - name: Check out code
        uses: actions/checkout@v4

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

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

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

      - name: Metadata for container
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=sha
            type=semver,pattern={{version}},enable=${{ github.event_name == 'push' }}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v5
        with:
          cache-from: type=gha,scope=${{ github.ref_name }}/${{ matrix.runner.platform }}
          cache-to: type=gha,mode=max,scope=${{ github.ref_name }}/${{ matrix.runner.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: ${{ matrix.runner.platform }}
          outputs: type=image,name=ghcr.io/${{ github.repository }},push-by-digest=true,name-canonical=true,push=true

      - name: Export digest
        id: digest
        run: |
          digest="${{ steps.build.outputs.digest }}"
          echo "digest=${digest#sha256:}" >> $GITHUB_OUTPUT

      - name: Create digest file
        run: |
          mkdir -p ${{ runner.temp }}/${{ matrix.runner.platform }}
          touch ${{ runner.temp }}/${{ matrix.runner.platform }}/${{ steps.digest.outputs.digest }}

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: ${{ steps.digest.outputs.digest }}
          path: ${{ runner.temp }}/${{ matrix.runner.platform }}/${{ steps.digest.outputs.digest }}
          if-no-files-found: error
          retention-days: 3

  push:
    name: "Push Images"
    needs: build
    runs-on: ubuntu-latest

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

      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          merge-multiple: true

      - name: Metadata for container
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=sha
            type=semver,pattern={{version}},enable=${{ github.event_name == 'push' }}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Create manifest list and push
        working-directory: ${{ runner.temp }}/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf 'ghcr.io/${{ github.repository }}@sha256:%s ' *)

      - name: Inspect merged image
        run: |
          jq -cr '.tags | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON" | \
          xargs -n1 docker buildx imagetools inspect