docker-release.yml

name: Publish Docker Image

on:
  workflow_dispatch:
    inputs:
      tag:
        description: "Published RELEASE.* tag to package as pgsty/silo"
        required: true
        type: string

permissions:
  contents: read
  id-token: write
  attestations: write
  artifact-metadata: write

concurrency:
  group: docker-release
  cancel-in-progress: false

jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      # Images are built from a published release rather than from the build
      # that produced it, so an abandoned draft can never leave :latest
      # pointing at something nobody shipped.
      - name: Validate published release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          INPUT_TAG: ${{ inputs.tag }}
        run: |
          set -euo pipefail
          TAG="${INPUT_TAG}"
          VERSION_HYPHEN="${TAG#RELEASE.}"
          PKG_VERSION="$(echo "${VERSION_HYPHEN}" | sed -E 's/^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2})-([0-9]{2})-([0-9]{2})Z$/\1\2\3\4\5\6.0.0/')"
          if [ "${PKG_VERSION}" = "${VERSION_HYPHEN}" ]; then
            echo "Invalid release tag: ${TAG}"
            exit 1
          fi

          IS_DRAFT="$(gh release view "${TAG}" --repo "${GITHUB_REPOSITORY}" --json isDraft --jq .isDraft)"
          IS_PRERELEASE="$(gh release view "${TAG}" --repo "${GITHUB_REPOSITORY}" --json isPrerelease --jq .isPrerelease)"
          PUBLISHED_AT="$(gh release view "${TAG}" --repo "${GITHUB_REPOSITORY}" --json publishedAt --jq .publishedAt)"
          LATEST_TAG="$(gh release view --repo "${GITHUB_REPOSITORY}" --json tagName --jq .tagName)"

          if [ "${IS_DRAFT}" != false ] || [ "${IS_PRERELEASE}" != false ] || [ -z "${PUBLISHED_AT}" ]; then
            echo "${TAG} must be a published, non-prerelease GitHub Release"
            exit 1
          fi
          # This workflow moves :latest, so it must not run for an older tag.
          if [ "${TAG}" != "${LATEST_TAG}" ]; then
            echo "Refusing to replace Docker latest with non-latest release ${TAG} (latest is ${LATEST_TAG})"
            exit 1
          fi

          {
            echo "RELEASE_TAG=${TAG}"
            echo "PKG_VERSION=${PKG_VERSION}"
            echo "PUBLISHED_AT=${PUBLISHED_AT}"
          } >> "${GITHUB_ENV}"

      - name: Validate Docker Hub credentials
        run: |
          set -euo pipefail
          if [ -z "${{ secrets.DOCKERHUB_USERNAME }}" ] || [ -z "${{ secrets.DOCKERHUB_TOKEN }}" ]; then
            echo "Missing Docker Hub credentials. Set DOCKERHUB_USERNAME and DOCKERHUB_TOKEN repository secrets."
            exit 1
          fi

      - name: Checkout release tag
        uses: actions/checkout@v7
        with:
          ref: ${{ inputs.tag }}
          fetch-depth: 0

      - name: Verify workflow identity matches release source
        run: |
          set -euo pipefail
          CHECKED_OUT_REVISION="$(git rev-parse HEAD)"
          if [ "${CHECKED_OUT_REVISION}" != "${GITHUB_SHA}" ]; then
            echo "Checked out ${CHECKED_OUT_REVISION}, but workflow identity is ${GITHUB_SHA}. Dispatch this workflow from ${RELEASE_TAG}." >&2
            exit 1
          fi

      - name: Prepare verified Docker contexts
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          assets_dir="docker-release/assets"
          mkdir -p "${assets_dir}"

          amd64_archive="silo_${PKG_VERSION}_linux_amd64.tar.gz"
          arm64_archive="silo_${PKG_VERSION}_linux_arm64.tar.gz"
          checksums="silo_${PKG_VERSION}_checksums.txt"
          gh release download "${RELEASE_TAG}" --repo "${GITHUB_REPOSITORY}" \
            --dir "${assets_dir}" \
            --pattern "${amd64_archive}" \
            --pattern "${arm64_archive}" \
            --pattern "${checksums}"

          # The binaries going into the images are the published ones, checked
          # against the published checksums, not a rebuild that merely ought to
          # match them. awk matches the manifest filename column exactly: a
          # substring grep would also pull in the archive's .sbom.json line,
          # whose file is deliberately not downloaded in this lane.
          cd "${assets_dir}"
          awk -v name="${amd64_archive}" '$2 == name' "${checksums}" | sha256sum --check
          awk -v name="${arm64_archive}" '$2 == name' "${checksums}" | sha256sum --check

          # The checksum manifest and both archives must have provenance from
          # this repository's release workflow at the exact checked-out tag.
          for artifact in "${checksums}" "${amd64_archive}" "${arm64_archive}"; do
            gh attestation verify "${artifact}" \
              --repo "${GITHUB_REPOSITORY}" \
              --signer-workflow "${GITHUB_REPOSITORY}/.github/workflows/release.yml" \
              --source-digest "$(git -C "${GITHUB_WORKSPACE}" rev-parse HEAD)" \
              --source-ref "refs/tags/${RELEASE_TAG}" >/dev/null
          done
          cd "${GITHUB_WORKSPACE}"

          # Dockerfile.goreleaser expects the binary at the context root and
          # the entrypoint scripts under dockerscripts/, which is the layout
          # GoReleaser used to assemble via extra_files.
          for arch in amd64 arm64; do
            context="docker-release/${arch}"
            archive="${assets_dir}/silo_${PKG_VERSION}_linux_${arch}.tar.gz"
            mkdir -p "${context}/dockerscripts"
            tar -xzf "${archive}" -C "${context}" silo
            cp Dockerfile.goreleaser Dockerfile.distroless LICENSE NOTICE CREDITS "${context}/"
            cp dockerscripts/docker-entrypoint.sh dockerscripts/download-static-curl.sh \
              "${context}/dockerscripts/"
          done

          echo "RELEASE_REVISION=$(git rev-parse HEAD)" >> "${GITHUB_ENV}"

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v4
        with:
          platforms: arm64

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Login to Docker Hub
        uses: docker/login-action@v4
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Install Syft
        uses: anchore/sbom-action/download-syft@e22c389904149dbc22b58101806040fa8d37a610 # v0.24.0
        with:
          syft-version: v1.50.0

      - name: Build and push amd64 image
        id: build-amd64
        uses: docker/build-push-action@v7
        with:
          context: docker-release/amd64
          file: docker-release/amd64/Dockerfile.goreleaser
          platforms: linux/amd64
          push: true
          tags: |
            pgsty/silo:${{ env.RELEASE_TAG }}-amd64
            pgsty/silo:latest-amd64
          labels: |
            org.opencontainers.image.version=${{ env.RELEASE_TAG }}
            org.opencontainers.image.created=${{ env.PUBLISHED_AT }}
            org.opencontainers.image.revision=${{ env.RELEASE_REVISION }}

      - name: Build and push arm64 image
        id: build-arm64
        uses: docker/build-push-action@v7
        with:
          context: docker-release/arm64
          file: docker-release/arm64/Dockerfile.goreleaser
          platforms: linux/arm64
          push: true
          tags: |
            pgsty/silo:${{ env.RELEASE_TAG }}-arm64
            pgsty/silo:latest-arm64
          labels: |
            org.opencontainers.image.version=${{ env.RELEASE_TAG }}
            org.opencontainers.image.created=${{ env.PUBLISHED_AT }}
            org.opencontainers.image.revision=${{ env.RELEASE_REVISION }}

      # The distroless variant is a pilot published alongside the classic
      # image; it ships the silo binary alone and relies on the native
      # `silo healthcheck` subcommand for container health.
      # Design: https://silo.pgsty.com/compatibility/feature/healthcheck/
      - name: Build and push amd64 distroless image
        id: build-amd64-distroless
        uses: docker/build-push-action@v7
        with:
          context: docker-release/amd64
          file: docker-release/amd64/Dockerfile.distroless
          platforms: linux/amd64
          push: true
          tags: |
            pgsty/silo:${{ env.RELEASE_TAG }}-distroless-amd64
            pgsty/silo:distroless-amd64
          labels: |
            org.opencontainers.image.version=${{ env.RELEASE_TAG }}
            org.opencontainers.image.created=${{ env.PUBLISHED_AT }}
            org.opencontainers.image.revision=${{ env.RELEASE_REVISION }}

      - name: Build and push arm64 distroless image
        id: build-arm64-distroless
        uses: docker/build-push-action@v7
        with:
          context: docker-release/arm64
          file: docker-release/arm64/Dockerfile.distroless
          platforms: linux/arm64
          push: true
          tags: |
            pgsty/silo:${{ env.RELEASE_TAG }}-distroless-arm64
            pgsty/silo:distroless-arm64
          labels: |
            org.opencontainers.image.version=${{ env.RELEASE_TAG }}
            org.opencontainers.image.created=${{ env.PUBLISHED_AT }}
            org.opencontainers.image.revision=${{ env.RELEASE_REVISION }}

      - name: Verify HEALTHCHECK survived the distroless push
        run: |
          set -euo pipefail
          # HEALTHCHECK is a Docker extension absent from the OCI image
          # spec, and a publish path can drop it silently. Check the pushed
          # architecture image now, before the versioned and rolling
          # multi-arch manifests are created, so a broken health config
          # stops their promotion. (The architecture-suffixed tags above
          # are already public by this point - full staging-then-promote
          # would be a workflow-wide redesign shared with the classic
          # image lanes.)
          docker pull "pgsty/silo:${RELEASE_TAG}-distroless-amd64" >/dev/null
          test "$(docker inspect -f '{{json .Config.Healthcheck.Test}}' "pgsty/silo:${RELEASE_TAG}-distroless-amd64")" \
            = '["CMD","/usr/bin/silo","healthcheck","ready"]'

      - name: Publish multi-architecture manifests
        run: |
          set -euo pipefail
          mkdir -p docker-release/metadata
          docker buildx imagetools create \
            --tag "pgsty/silo:${RELEASE_TAG}" \
            --metadata-file docker-release/metadata/release.json \
            "pgsty/silo:${RELEASE_TAG}-amd64" \
            "pgsty/silo:${RELEASE_TAG}-arm64"
          docker buildx imagetools create \
            --tag "pgsty/silo:latest" \
            --metadata-file docker-release/metadata/latest.json \
            "pgsty/silo:latest-amd64" \
            "pgsty/silo:latest-arm64"
          docker buildx imagetools inspect "pgsty/silo:${RELEASE_TAG}"
          docker buildx imagetools inspect "pgsty/silo:latest"

          docker buildx imagetools create \
            --tag "pgsty/silo:${RELEASE_TAG}-distroless" \
            --metadata-file docker-release/metadata/release-distroless.json \
            "pgsty/silo:${RELEASE_TAG}-distroless-amd64" \
            "pgsty/silo:${RELEASE_TAG}-distroless-arm64"
          docker buildx imagetools create \
            --tag "pgsty/silo:distroless" \
            --metadata-file docker-release/metadata/distroless.json \
            "pgsty/silo:distroless-amd64" \
            "pgsty/silo:distroless-arm64"
          docker buildx imagetools inspect "pgsty/silo:${RELEASE_TAG}-distroless"
          docker buildx imagetools inspect "pgsty/silo:distroless"

          RELEASE_DIGEST="$(jq -r '."containerimage.descriptor".digest' docker-release/metadata/release.json)"
          LATEST_DIGEST="$(jq -r '."containerimage.descriptor".digest' docker-release/metadata/latest.json)"
          if ! [[ "${RELEASE_DIGEST}" =~ ^sha256:[0-9a-f]{64}$ ]]; then
            echo "Invalid release manifest digest: ${RELEASE_DIGEST}" >&2
            exit 1
          fi
          if [ "${RELEASE_DIGEST}" != "${LATEST_DIGEST}" ]; then
            echo "Release and latest tags resolved to different manifests" >&2
            exit 1
          fi
          echo "SILO_IMAGE_DIGEST=${RELEASE_DIGEST}" >> "${GITHUB_ENV}"

          DISTROLESS_RELEASE_DIGEST="$(jq -r '."containerimage.descriptor".digest' docker-release/metadata/release-distroless.json)"
          DISTROLESS_ROLLING_DIGEST="$(jq -r '."containerimage.descriptor".digest' docker-release/metadata/distroless.json)"
          if ! [[ "${DISTROLESS_RELEASE_DIGEST}" =~ ^sha256:[0-9a-f]{64}$ ]]; then
            echo "Invalid distroless manifest digest: ${DISTROLESS_RELEASE_DIGEST}" >&2
            exit 1
          fi
          if [ "${DISTROLESS_RELEASE_DIGEST}" != "${DISTROLESS_ROLLING_DIGEST}" ]; then
            echo "Distroless release and rolling tags resolved to different manifests" >&2
            exit 1
          fi
          echo "SILO_DISTROLESS_DIGEST=${DISTROLESS_RELEASE_DIGEST}" >> "${GITHUB_ENV}"

      - name: Generate architecture image SBOMs
        env:
          AMD64_DIGEST: ${{ steps.build-amd64.outputs.digest }}
          ARM64_DIGEST: ${{ steps.build-arm64.outputs.digest }}
          DISTROLESS_AMD64_DIGEST: ${{ steps.build-amd64-distroless.outputs.digest }}
          DISTROLESS_ARM64_DIGEST: ${{ steps.build-arm64-distroless.outputs.digest }}
          SYFT_CHECK_FOR_APP_UPDATE: "false"
        run: |
          set -euo pipefail
          mkdir -p docker-release/sbom
          # Each per-architecture digest names an OCI index (image plus the
          # provenance attestation buildx attaches), and Syft's platform
          # default on an index follows the amd64 runner - an arm64-only
          # index would fail outright. Select the platform explicitly.
          syft "registry:index.docker.io/pgsty/silo@${AMD64_DIGEST}" \
            --platform linux/amd64 \
            --output "spdx-json=docker-release/sbom/linux-amd64.spdx.json"
          syft "registry:index.docker.io/pgsty/silo@${ARM64_DIGEST}" \
            --platform linux/arm64 \
            --output "spdx-json=docker-release/sbom/linux-arm64.spdx.json"
          syft "registry:index.docker.io/pgsty/silo@${DISTROLESS_AMD64_DIGEST}" \
            --platform linux/amd64 \
            --output "spdx-json=docker-release/sbom/linux-amd64-distroless.spdx.json"
          syft "registry:index.docker.io/pgsty/silo@${DISTROLESS_ARM64_DIGEST}" \
            --platform linux/arm64 \
            --output "spdx-json=docker-release/sbom/linux-arm64-distroless.spdx.json"

      - name: Attest amd64 image SBOM
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ steps.build-amd64.outputs.digest }}
          sbom-path: docker-release/sbom/linux-amd64.spdx.json
          push-to-registry: true

      - name: Attest arm64 image SBOM
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ steps.build-arm64.outputs.digest }}
          sbom-path: docker-release/sbom/linux-arm64.spdx.json
          push-to-registry: true

      - name: Attest amd64 distroless image SBOM
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ steps.build-amd64-distroless.outputs.digest }}
          sbom-path: docker-release/sbom/linux-amd64-distroless.spdx.json
          push-to-registry: true

      - name: Attest arm64 distroless image SBOM
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ steps.build-arm64-distroless.outputs.digest }}
          sbom-path: docker-release/sbom/linux-arm64-distroless.spdx.json
          push-to-registry: true

      - name: Attest multi-architecture image provenance
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ env.SILO_IMAGE_DIGEST }}
          push-to-registry: true

      - name: Attest multi-architecture distroless image provenance
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
        with:
          subject-name: index.docker.io/pgsty/silo
          subject-digest: ${{ env.SILO_DISTROLESS_DIGEST }}
          push-to-registry: true