chore: GitHub Actions を commit SHA でピン留め

[nanasess]

概要

supply-chain 対策として、すべての GitHub Actions を mutable なタグ参照から不変の commit SHA 参照に切り替えます。

変更内容

• .github/workflows/deploy.yml の uses: を owner/repo@<40文字SHA> # vX.Y.Z 形式に変換（pinact 3.9.0 で自動生成）
• 対象: actions/checkout / 1password/load-secrets-action / peaceiris/actions-hugo / cloudflare/wrangler-action
• Dependabot (github-actions) は既存設定のままで SHA アップデート可能

動機

• タグ（@v3 等）は mutable で、Action 作者アカウント侵害時に @v3 が差し替えられた場合、次回デプロイで汚染コードが取り込まれる
• 個人アカウント所有の peaceiris/actions-hugo は相対的にリスクが高く、SHA ピン留めの恩恵が特に大きい

動作確認

• main へのマージ後、Cloudflare Pages へのデプロイが成功

関連

EcAuth organization 配下のほかのリポジトリでも同一方針で順次対応します。

🤖 Generated with Claude Code

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8b2d7be5-0efe-4522-87b9-7993a366f7a0

📥 Commits

Reviewing files that changed from the base of the PR and between a351b02 and e65309d.

📒 Files selected for processing (1)

• .github/workflows/deploy.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/actions-commit-hash

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