perf: shallow-clone the target branch only

[barbarj]

This PR modifies the action to shallow clone the target branch only.

Why: For large repos, the time to do a full clone and checkout can be 20 minutes plus, which is long enough to cause retry loops when the branch tip is under contention by multiple benchmark runs.

Summary by CodeRabbit

• Performance Improvements
  • Benchmark repositories are now retrieved using a faster, shallow clone of only the required GitHub Pages branch.
  • Removed the separate branch checkout step during benchmark publishing.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 26a05144-218b-4f38-ac4e-b710f90c59aa

📥 Commits

Reviewing files that changed from the base of the PR and between 86d8bcf and cc051ea.

📒 Files selected for processing (3)

• src/git.ts
• src/write.ts
• test/write.spec.ts

💤 Files with no reviewable changes (1)

• src/git.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The GitHub Pages repository flow now performs a shallow, single-branch clone at gh-pages. The separate checkout helper call and its test expectations were removed.

Changes

GitHub Pages branch cloning

Layer / File(s)	Summary
Shallow branch clone and checkout removal src/write.ts, src/git.ts, test/write.spec.ts	git.clone now receives --branch, --single-branch, and --depth 1. The separate checkout helper and related test expectations were removed. Existing rollback and work-tree configuration remain unchanged.

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

Merge Risk: ⚪ Minimal · up to cc051

This localized change updates branch checkout behavior, and no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: shallow-cloning only the target branch.
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

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