PR作成時に自動でレビュワーを設定するGitHub Actionsを追加

[komagata]

概要

DraftではないPull Requestが作成されたときに、自動でレビュワーを設定するGitHub Actionsワークフローを追加しました。

実装内容

• .github/workflows/auto-assign-reviewer.ymlを作成
• PR作成時（opened）およびDraftからReady for reviewに変更時（ready_for_review）にトリガー
• komagataとokuramasafumiを3:2の確率で重み付きランダム選択
• PR作成者自身がレビュワーに選ばれた場合は自動でスキップ

動作条件

• DraftではないPRのみが対象
• PR作成者は自動的にレビュワー候補から除外

テスト計画

• 実際にPRを作成してレビュワーが自動設定されることを確認
• 確率の偏りがないことを複数回のテストで確認

Summary by CodeRabbit

• 新機能
  • プルリクエスト作成時に、重み付きランダムで自動的にレビュワーが割り当てられるようになりました。

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

新しいGitHub Actionsワークフロー「Auto Assign Reviewer」が追加されました。プルリクエストがオープンまたはレビュー準備完了時に発火し、ドラフトでない場合のみ実行されます。重み付きランダム選択アルゴリズムでレビュワーを自動割り当てします。

Changes

ファイルパス	変更概要
.github/workflows/auto-assign-reviewer.yml	プルリクエスト時に重み付きランダムでレビュワーを自動割当するワークフロー新規追加

Sequence Diagram(s)

sequenceDiagram
    participant PR as Pull Request
    participant GitHub Actions
    participant Reviewer
    participant Author

    PR->>GitHub Actions: PRがopenedまたはready_for_review
    GitHub Actions->>GitHub Actions: レビュワー候補リストから重み付きランダム選択
    GitHub Actions->>Author: 選択レビュワーが作者か確認
    alt 選択レビュワー ≠ 作者
        GitHub Actions->>Reviewer: レビューリクエスト送信
    else 選択レビュワー = 作者
        GitHub Actions->>GitHub Actions: 割当スキップ
    end

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~6 minutes

Poem

🐇
新しい風が吹くGitの森、
レビュワー選びは運任せ、
重みを乗せてピョンと跳ね、
ランダム割当、誰が来る？
コードの旅路に幸あれ！

Note

⚡️ Unit Test Generation is now available in beta!

Learn more here, or try it out under "Finishing Touches" below.

---

📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0e9b787 and ec5640f.

📒 Files selected for processing (1)

• .github/workflows/auto-assign-reviewer.yml (1 hunks)

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/auto-assign-reviewer

---

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