Refactor PR labeler configuration and upgrade to v5

[TinyKitten]

Summary

Updated the PR labeler workflow to use the latest version of the labeler action and restructured the labeling configuration to separate file-based and branch-based labeling strategies. #1377

Key Changes

• Upgraded actions/labeler from v4 to v5 in the PR labeler workflow
• Refactored .github/labeler.yml to use the new changed-files syntax with any-glob-to-any-file matchers, which is required by labeler v5
• Removed branch-based labels (deploy-prod, deploy-staging, deploy-dev) from the file-based labeler configuration
• Added new workflow job label-by-branch using TimonVS/pr-labeler-action@v5 to handle branch-based labeling separately
• Created .github/pr-labeler.yml with:
  • Head branch (source) patterns for feature, fix, chore, data, and release branches
  • Base branch (target) patterns for deployment labels (production, dev, staging)

Implementation Details

The labeling logic is now split into two independent jobs:

1. label-by-files: Uses the official GitHub labeler action to apply labels based on changed files
2. label-by-branch: Uses a community action to apply labels based on branch naming conventions

This separation provides better maintainability and allows for independent scaling of each labeling strategy.

https://claude.ai/code/session_011JibAfjh65ao3VdZFJhXka

Summary by CodeRabbit

リリースノート

• Chores
  • プルリクエストの自動ラベリングシステムを改善しました。新しいブランチパターン（data/、release/、chore/*）に対応し、デプロイメント対象ブランチ（production、dev、staging）に基づくラベル付けが可能になりました。

[coderabbitai]

📝 Walkthrough

Walkthrough

GitHubのPRラベリングワークフローを強化するため、ラベラー設定ファイルを再構成し、新しい分岐パターンを追加し、アクションバージョンをv4からv5にアップグレードしました。

Changes

Cohort / File(s)	Summary
ラベラー設定の構造化 .github/labeler.yml	グロブパターンをフラットリストからネストされたchanged-files構造（any-glob-to-any-file）に再構成。ci/cd、rust、protobuf、documentation、dataセクションを更新。
PRラベラー設定の拡張 .github/pr-labeler.yml	新しいhead-branchパターン（data/*、release/*、chore/*）と、base-branchマッピング（deploy:production → master、deploy:dev → dev、deploy:staging → staging）を追加。
ワークフロー定義の更新 .github/workflows/pr_labeler.yml	既存ジョブをtriageからlabel-by-filesに改名、actions/labelerをv4からv5にアップグレード。新しいlabel-by-branchジョブ（TimonVS/pr-labeler-action@v5）を追加。

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

ci/cd

Poem

🐰 ラベルを整えて、ファイルも分岐も
新しい構造でスッキリ再編
v5へアップデート、ワークフロー躍進
PRの整理整頓、完璧さ求めて🏷️

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main changes: refactoring the PR labeler configuration and upgrading the action from v4 to v5.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/add-pr-labeler-R8vwN

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