fix: add --repo flag and configurable git identity for homebrew-tap

[luxass]

Summary

• Added --repo "$GITHUB_REPOSITORY" to gh release download so it works without a local git checkout
• Added configurable git-user-name and git-user-email inputs with sensible defaults (luxass-homebrew)
• Updated documentation in reusable-homebrew-tap.md

Related

Fixes the 'Author identity unknown' error when the workflow tries to commit to the tap repository.

Summary by CodeRabbit

• New Features
  • Reusable Homebrew tap workflow now supports configurable git user name and email inputs for controlling commit author identity during formula updates. Default values ensure seamless operation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0fac8657-e9ef-4171-93f8-5f0c02fd3fda

📥 Commits

Reviewing files that changed from the base of the PR and between 6c46d97 and f6b90f2.

📒 Files selected for processing (2)

• .github/workflows/reusable-homebrew-tap.md
• .github/workflows/reusable-homebrew-tap.yaml

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Walkthrough

This PR extends the reusable Homebrew tap workflow to accept optional inputs that customize the Git author identity (name and email) used when creating commits. The workflow inputs are declared with sensible defaults and applied when configuring Git during PR creation, with documentation added to guide callers.

Changes

Git Author Identity Configuration

Layer / File(s)	Summary
Git Author Identity Inputs .github/workflows/reusable-homebrew-tap.yaml, .github/workflows/reusable-homebrew-tap.md	New git-user-name and git-user-email inputs (with defaults luxass-homebrew and luxass-homebrew[bot]@users.noreply.github.com``) are declared in the workflow and used to configure Git identity in the PR creation step; documentation is updated to reflect these options.

🎯 1 (Trivial) | ⏱️ ~3 minutes

A workflow gains the author's voice so clear,
With inputs to customize who commits here,
From luxass-homebrew's gentle hand,
The tap updates stand proud and grand.
Configurable, flexible, ready to brew,
This reusable recipe makes names true! 🍺

🚥 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 accurately describes the main changes: adding --repo flag and configurable git identity (git-user-name and git-user-email inputs) to the homebrew-tap workflow.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/homebrew-tap-download-repo

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