[CI] - Auto-update Homebrew formula on release

[maatheusgois-dd]

Summary

• Adds a new update-homebrew job to the release workflow that automatically updates the Homebrew tap formula (XcodeBazelMCP/homebrew-tap) after each npm publish
• Downloads the new npm tarball, computes the sha256, and commits the updated formula

Setup required

• Create a fine-grained PAT with Contents read/write access to XcodeBazelMCP/homebrew-tap
• Add it as HOMEBREW_TAP_TOKEN in repo secrets

Test plan

• Trigger a manual release via workflow_dispatch and verify the homebrew-tap formula gets updated
• Verify brew upgrade xcodebazelmcp picks up the new version

Made with Cursor

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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