docker-base-distro/.gitea/workflows/publish.yaml

name: Build and Push Base Distro Images

on:
  release:
    types: [published, prereleased]
  push:
    paths:
      - '.gitea/workflows/publish.yaml'

permissions:
  contents: read

env:
  IMAGE_NAME: base-distro
  APKO_VERSION: 1.1.2

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        include:
          - config: apko/base.yaml
            variant: base
          - config: apko/build.yaml
            variant: build
          - config: apko/dotnet-runtime.yaml
            variant: dotnet-runtime
          - config: apko/dotnet-sdk.yaml
            variant: dotnet-sdk
          - config: apko/flutter-sdk.yaml
            variant: flutter-sdk
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Determine tag type
        id: tag
        run: |
          if [[ "${{ github.event.release.prerelease }}" == "true" ]]; then
            echo "suffix=dev" >> $GITHUB_OUTPUT
          else
            echo "suffix=latest" >> $GITHUB_OUTPUT
          fi          

      - name: Install apko
        run: |
          APKO_ARCH=$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/')
          APKO_VER="${{ env.APKO_VERSION }}"
          curl -fsSL "https://github.com/chainguard-dev/apko/releases/download/v${APKO_VER}/apko_${APKO_VER}_linux_${APKO_ARCH}.tar.gz" \
            -o /tmp/apko.tar.gz
          tar xzf /tmp/apko.tar.gz --strip-components=1 -C /usr/local/bin
          rm /tmp/apko.tar.gz          

      - 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 Registry
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Determine upstream version
        id: version
        run: |
          VARIANT="${{ matrix.variant }}"

          case "$VARIANT" in
            base|build)
              UPSTREAM=$(apko resolve ${{ matrix.config }} 2>&1 | grep -oP 'glibc-\K[0-9]+\.[0-9]+' | head -1 || echo "0.0")
              if [ "$UPSTREAM" = "" ] || [ "$UPSTREAM" = "0.0" ]; then
                UPSTREAM=$(apko resolve ${{ matrix.config }} 2>&1 | grep -oP 'glibc \(\K[0-9]+\.[0-9]+' | head -1 || echo "2.42")
              fi
              ;;
            dotnet-runtime)
              UPSTREAM=$(curl -fsSL "https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json" \
                | jq -r '[."releases-index"[] | select(."support-phase" == "active" or ."support-phase" == "go-live") | ."latest-runtime"] | sort_by(. | split(".") | map(tonumber)) | last')
              ;;
            dotnet-sdk)
              UPSTREAM=$(curl -fsSL "https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json" \
                | jq -r '[."releases-index"[] | select(."support-phase" == "active" or ."support-phase" == "go-live") | ."latest-sdk"] | sort_by(. | split(".") | map(tonumber)) | last')
              ;;
            flutter-sdk)
              UPSTREAM=$(curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json" \
                | jq -r '.current_release.stable as $hash | .releases[] | select(.hash == $hash and .channel == "stable") | .version')
              ;;
          esac

          echo "upstream=${UPSTREAM}" >> "$GITHUB_OUTPUT"
          echo "Upstream version for ${VARIANT}: ${UPSTREAM}"

          REPO_NAME="${{ env.IMAGE_NAME }}"
          REGISTRY_URL="${{ secrets.REGISTRY_URL }}"
          NAMESPACE=$(echo "$REGISTRY_URL" | sed 's|.*://||; s|.*\.io/||; s|/$||')

          EXISTING_TAGS=$(curl -s "https://hub.docker.com/v2/repositories/${NAMESPACE}/${REPO_NAME}/tags?page_size=100&name=${VARIANT}-${UPSTREAM}." \
            | jq -r '.results[]?.name // empty' 2>/dev/null || echo "")

          MAX_BUILD=0
          for tag in $EXISTING_TAGS; do
            BUILD_NUM=$(echo "$tag" | grep -oP "\.\K[0-9]+$" || echo "0")
            if [ "$BUILD_NUM" -gt "$MAX_BUILD" ] 2>/dev/null; then
              MAX_BUILD=$BUILD_NUM
            fi
          done

          NEXT_BUILD=$((MAX_BUILD + 1))
          VERSION_TAG="${VARIANT}-${UPSTREAM}.${NEXT_BUILD}"
          echo "version_tag=${VERSION_TAG}" >> "$GITHUB_OUTPUT"
          echo "Next version tag: ${VERSION_TAG}"          

      - name: Build per-arch apko tarballs
        run: |
          mkdir -p /tmp/build-amd64 /tmp/build-arm64
          apko build --arch x86_64 ${{ matrix.config }} \
            ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ matrix.variant }}-${{ steps.tag.outputs.suffix }} \
            /tmp/build-amd64/image.tar
          apko build --arch aarch64 ${{ matrix.config }} \
            ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ matrix.variant }}-${{ steps.tag.outputs.suffix }} \
            /tmp/build-arm64/image.tar

          # Extract the rootfs layer from the OCI archive for each arch.
          # apko outputs an OCI image tarball; we need to extract just the
          # filesystem layer (.tar.gz) and the config metadata.
          for arch in amd64 arm64; do
            cd /tmp/build-${arch}
            tar xf image.tar
            # The .tar.gz file is the filesystem layer
            ROOTFS=$(ls *.tar.gz 2>/dev/null | head -1)
            mv "$ROOTFS" rootfs.tar.gz
            # Extract ENV and ENTRYPOINT from the OCI config
            MANIFEST_DIGEST=$(jq -r '.manifests[0].digest' index.json | sed 's/sha256://')
            CONFIG_DIGEST=$(jq -r '.config.digest' "sha256:${MANIFEST_DIGEST}" | sed 's/sha256://')
            cp "sha256:${CONFIG_DIGEST}" config.json
            # Clean up OCI artifacts
            rm -f image.tar index.json manifest.json oci-layout sha256:*
            cd /tmp
          done

          # Generate Dockerfile with metadata from the OCI config
          # (use amd64 config as reference — env vars are the same for both arches)
          ENV_LINES=$(jq -r '(.config.Env // [])[] | "ENV " + .' /tmp/build-amd64/config.json)
          ENTRYPOINT=$(jq -r '(.config.Entrypoint // [])[]' /tmp/build-amd64/config.json | head -1)
          USER_ID=$(jq -r '.config.User // "65532"' /tmp/build-amd64/config.json)
          WORKDIR=$(jq -r '.config.WorkingDir // "/"' /tmp/build-amd64/config.json)

          {
            echo "FROM scratch"
            echo "ARG TARGETARCH"
            echo "ADD build-\${TARGETARCH}/rootfs.tar.gz /"
            if [ -n "$ENV_LINES" ]; then
              echo "$ENV_LINES"
            fi
            if [ -n "$ENTRYPOINT" ] && [ "$ENTRYPOINT" != "null" ]; then
              echo "ENTRYPOINT [\"${ENTRYPOINT}\"]"
            fi
            echo "WORKDIR ${WORKDIR}"
            echo "USER ${USER_ID}"
          } > /tmp/Dockerfile          

      - name: Build and push with buildx (SBOM + provenance)
        uses: docker/build-push-action@v5
        with:
          context: /tmp
          file: /tmp/Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          sbom: true
          provenance: mode=max
          tags: |
            ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ matrix.variant }}-${{ steps.tag.outputs.suffix }}
            ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version_tag }}            

      - name: Install Docker Scout
        run: |
          curl -fsSL https://raw.githubusercontent.com/docker/scout-cli/main/install.sh -o install-scout.sh
          sh install-scout.sh          

      - name: Docker Scout CVE Scan
        run: |
          docker pull ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ matrix.variant }}-${{ steps.tag.outputs.suffix }}
          docker scout cves ${{ secrets.REGISTRY_URL }}/${{ env.IMAGE_NAME }}:${{ matrix.variant }}-${{ steps.tag.outputs.suffix }} --only-severity critical,high