Summary

• The nuq-postgres Docker image was only built for linux/amd64, causing emulation on Apple Silicon and other arm64 hosts
• Updated the CI workflow to use the same multi-arch build pattern (matrix strategy + manifest job) used by firecrawl and playwright-service images
• Now builds and publishes for both linux/amd64 and linux/arm64

Closes #3291

Test plan

• Trigger the workflow manually via workflow_dispatch and verify both platform images are pushed
• Verify docker manifest inspect ghcr.io/firecrawl/nuq-postgres:latest shows both amd64 and arm64 entries

🤖 Generated with Claude Code

Summary by cubic

Build nuq-postgres for both linux/amd64 and linux/arm64 to stop emulation on Apple Silicon and other arm64 hosts. CI now follows the same multi-arch pattern as firecrawl and playwright-service.

• Bug Fixes
  • Add matrix build for linux/amd64 and linux/arm64 using Blacksmith runners.
  • Push per-arch tags and publish a multi-arch latest manifest to GHCR.
  • Use useblacksmith/setup-docker-builder and useblacksmith/build-push-action; normalize repo owner to lowercase.
  • Trigger on apps/nuq-postgres/** and workflow file changes.

^{Written for commit 3c5c091. Summary will update on new commits.}