ci: native six-platform release matrix + multi-arch container

goreleaser builds the six-platform binary matrix (linux/darwin/windows ×
amd64/arm64) with SBOMs and checksums on `v*` tag push. docker.yml is
pinned to the lux-build-linux-{amd64,arm64} ARC runners (native, no
QEMU) and delegates to the canonical hanzoai/.github reusable workflow.
release.yml triggers on `v*` tags and runs on the lux-build self-hosted
scale-set.

.github/workflows/docker.yml

@@ -0,0 +1,21 @@
+name: Docker
+on:
+  workflow_dispatch:
+  push:
+    branches: [main, dev, test]
+    tags: ['v*']
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  docker:
+    uses: hanzoai/.github/.github/workflows/docker-build.yml@main
+    with:
+      image: ghcr.io/luxfi/broker
+      # Native multi-arch on lux-org ARC scale-sets — no QEMU.
+      runner-amd64: lux-build-linux-amd64
+      runner-arm64: lux-build-linux-arm64
+      runner-deploy: lux-deploy-linux-amd64
+    secrets: inherit

.github/workflows/release.yml

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+name: Release
+
+# Native binary release for brokerd on `v*` tags.
+#
+# Six-platform matrix (linux/darwin/windows × amd64/arm64) via goreleaser.
+# Container image is built independently by .github/workflows/docker.yml
+# (native multi-arch ARC runners — NO QEMU).
+#
+# Runner labels: lux-build self-hosted ARC scale-sets per the org policy.
+# GitHub-hosted runners are NOT a permitted fallback.
+
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  packages: write
+  id-token: write
+
+jobs:
+  goreleaser:
+    runs-on: lux-build
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Install syft for SBOM
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/anchore/syft/main/install.sh \
+            | sh -s -- -b /usr/local/bin
+
+      - uses: goreleaser/goreleaser-action@v6
+        with:
+          distribution: goreleaser
+          version: "~> v2"
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yml

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+# goreleaser config for brokerd.
+#
+# Triggered by the release workflow on `v*` tag push. Builds native
+# binaries for all six policy platforms, produces tarballs + zips +
+# checksums + SBOM, and attaches them to the GitHub Release.
+#
+# Container images are built separately by `.github/workflows/docker.yml`
+# (native multi-arch via hanzoai/.github reusable workflow).
+
+version: 2
+
+project_name: brokerd
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  - id: brokerd
+    main: ./cmd/brokerd
+    binary: brokerd
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+    ldflags:
+      - -s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - arm64
+
+archives:
+  - id: brokerd
+    builds: [brokerd]
+    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    format_overrides:
+      - goos: windows
+        format: zip
+    files:
+      - LICENSE*
+      - README*
+
+checksum:
+  name_template: checksums.txt
+
+sboms:
+  - artifacts: archive
+
+snapshot:
+  version_template: "{{ incpatch .Version }}-next"
+
+changelog:
+  use: github
+  sort: asc
+
+release:
+  draft: false
+  prerelease: auto
+  mode: append