ci: use authenticated Homebrew tap checkout

[robjtede]

Checks out x52dev/homebrew-tap with the scoped GitHub App token before running the shared updater. The checkout owns Git authentication and persists it only for that tap working tree; the updater uses ordinary Git commands there. The same installation token remains in GH_TOKEN for release downloads and gh pr create.

Pins the merged x52dev/nix#17 commit, which makes the prepared tap checkout a documented requirement and removes manual credential-helper and HTTP-header handling from the updater.

Validation:

• nix develop -c just check
• nix flake check path:.
• nix develop .#ci-release -c x52-update-homebrew-tap --help
• zizmor .github/workflows/update-homebrew-tap.yml

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d8ceb32e-e737-4d42-93d5-6ccd0a3b9ff2

📥 Commits

Reviewing files that changed from the base of the PR and between d8b71d5 and b802fab.

📒 Files selected for processing (1)

• CHANGELOG.md

📝 Walkthrough

Walkthrough

The Homebrew tap workflow now checks out x52dev/homebrew-tap with the generated GitHub App token. It passes the checkout path to the tap update command through X52_HOMEBREW_TAP_DIRECTORY.

Changes

Homebrew tap update

Layer / File(s)	Summary
Tap checkout and update configuration .github/workflows/update-homebrew-tap.yml	The workflow checks out the Homebrew tap into homebrew-tap and configures the update command with its path.

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

Possibly related PRs

• x52dev/inspect-cert-chain#480: Introduced the Homebrew tap update workflow that this change extends.
• x52dev/inspect-cert-chain#484: Updates the same workflow and Homebrew update command with version argument handling.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the workflow change to use an authenticated Homebrew tap checkout.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/homebrew-tap-http-auth

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