fix: publish multi-arch (amd64 + arm64) Docker image

[aliasunder]

Problem

deploy.yml builds the image for linux/amd64 only. Because the release build uses buildx/build-push-action@v7, the published :latest is a manifest list (index) that contains a single amd64 entry. On Apple Silicon (linux/arm64), docker compose pull then fails hard:

no matching manifest for linux/arm64/v8 in the manifest list entries

Unlike a plain single-arch image (which Docker runs under emulation with a warning), a manifest list without an arm64 entry makes Docker refuse to pull. So the local-quickstart audience — heavily Mac, especially for the Cline Marketplace — can't pull current code at all and gets pinned to whatever stale image is cached locally. (Surfaced live: a Mac was stuck running 0.12.1 and couldn't upgrade.)

Fix

• Add docker/setup-qemu-action so the amd64 runner can cross-build arm64.
• Build linux/amd64,linux/arm64.

The published index now carries both platforms: arm64 hosts pull natively, and amd64 (including the Lightsail deploy target) is unchanged. One-file change.

Notes / things to watch on the next release

• Takes effect on the next release+deploy — deploy.yml is workflow_call'd from the release workflows, so a release must run to rebuild and repush a multi-arch :latest. This is a fix: commit, so it should auto-cut a patch release on merge.
• Build time — arm64 cross-build runs under QEMU and better-sqlite3 compiles from source on Alpine/musl (the Dockerfile already carries python3 make g++ for this). Expect a noticeably longer release build.
• Verify after the release: confirm mcp-publisher still reads the io.modelcontextprotocol.server.name label off the now multi-arch manifest in publish-registry.yml, and that :latest pulls natively on arm64.

🤖 Generated with Claude Code

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Generated by Claude Code

Summary by CodeRabbit

• Chores
  • Enhanced deployment infrastructure to support additional processor architectures (ARM64), enabling the application to run on a broader range of devices and systems.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The deployment workflow is updated to build and push Docker images for multiple architectures. QEMU support is added to enable cross-platform builds, and the Docker build configuration now targets both AMD64 and ARM64 platforms instead of only AMD64.

Changes

Multi-architecture Docker builds

Layer / File(s)	Summary
QEMU setup and multi-arch platform configuration .github/workflows/deploy.yml	QEMU emulation is enabled via docker/setup-qemu-action@v3, and Docker build platforms are expanded from linux/amd64 to linux/amd64,linux/arm64 for multi-architecture image publishing.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Multi-arch builds, here we go!
AMD and ARM, both in tow,
QEMU magic makes it flow—
Two platforms run, our images glow! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: publish multi-arch (amd64 + arm64) Docker image' clearly and accurately summarizes the main change: enabling multi-architecture Docker image publishing for both amd64 and arm64 architectures.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/vault-bootstrap-setup-TZgxO

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