feat: add Homebrew installer via cargo-dist

[Bortlesboat]

Summary

• Enable the cargo-dist homebrew installer in dist-workspace.toml
• Configure tap repository as googleworkspace/homebrew-tap

Addresses #90

How it works

cargo-dist natively supports Homebrew — adding "homebrew" to the installers list makes the release workflow automatically generate and push a Homebrew formula to the configured tap repo.

Prerequisites

A googleworkspace/homebrew-tap repository needs to be created on GitHub (can be empty) with write access from the release workflow. The tap name is configurable — happy to adjust if the team prefers a different naming convention.

Usage (after setup)

brew tap googleworkspace/homebrew-tap
brew install gws

Test plan

• Verify cargo-dist generates a valid Homebrew formula in CI plan mode
• Create tap repo and test end-to-end install on macOS

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[changeset-bot]

🦋 Changeset detected

Latest commit: c3aadbe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@googleworkspace/cli	Minor

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[Bortlesboat]

I have signed the Google CLA — please re-check.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.94%. Comparing base (99a6284) to head (51dbdf5).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   54.95%   54.94%   -0.02%     
==========================================
  Files          37       37              
  Lines       12218    12222       +4     
==========================================
  Hits         6715     6715              
- Misses       5503     5507       +4     

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