ci: update Homebrew tap after release

[robjtede]

Adds a release-published workflow that creates a scoped x52dev/homebrew-tap App token and opens a formula-update PR after each release.

The workflow derives the version from protobug’s package-prefixed release tags. It also refreshes the x52dev/nix lock input because the prior revision did not provide x52-update-homebrew-tap.

Validated with actionlint and nix flake check path:.

Summary by CodeRabbit

• New Features
  • Added automated Homebrew formula updates whenever a new release is published.
  • Homebrew users can now install the latest release through the tap without manual formula updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 41d70dd3-9ed3-4009-83f6-15c08f0e4e47

📥 Commits

Reviewing files that changed from the base of the PR and between ccddf2e and fbd95cb.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• .github/workflows/update-homebrew-tap.yml

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📝 Walkthrough

Walkthrough

The pull request adds a release-triggered GitHub Actions workflow. The workflow prepares the Nix release environment, authenticates with the Homebrew tap repository, checks out the tap, and updates the protobug formula from the release tag.

Changes

Homebrew tap automation

Layer / File(s)	Summary
Release workflow setup .github/workflows/update-homebrew-tap.yml	The workflow runs for published releases in the x52dev repository. It checks out the source, installs Nix, and enters the CI release devshell.
Tap update execution .github/workflows/update-homebrew-tap.yml	The workflow creates a GitHub App token, checks out x52dev/homebrew-tap, and runs x52-update-homebrew-tap for protobug using the release tag version.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• x52dev/protobug#264: Adds and configures the .#release Nix dev shell used by this workflow.

🚥 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 clearly summarizes the workflow that updates the Homebrew tap after a release.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/homebrew-tap-updates

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