feat(ci): pnpm updater

[avivkeller]

Add a workflow to update pnpm once a month via the pnpm self-update command.

[vercel]

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Project	Deployment	Review	Updated (UTC)
nodejs-org	Ready	Preview	Jan 9, 2026 10:12pm

[github-actions]

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/web-infra

Please review the changes when you have a chance. Thank you! 🙏

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.70%. Comparing base (274f68a) to head (5de1fad).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8532      +/-   ##
==========================================
+ Coverage   74.69%   74.70%   +0.01%     
==========================================
  Files         102      102              
  Lines        8956     8956              
  Branches      305      305              
==========================================
+ Hits         6690     6691       +1     
+ Misses       2264     2263       -1     
  Partials        2        2              

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[Copilot]

Pull request overview

This PR adds a new GitHub Actions workflow to automate monthly updates of pnpm using the pnpm self-update command. The workflow runs on a schedule, updates pnpm, and creates a pull request with the changes.

• Adds automated monthly pnpm updates via scheduled cron job
• Captures old and new pnpm versions for PR metadata
• Creates draft PRs with fast-track label for review

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[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total Size	3.74 MB
New Total Size	3.74 MB
Delta	0 B (0.00%)

Changes

➕ Added Assets (1)

Name	Size
.next/static/chunks/c5540154b3311d1d.js	204.38 KB

➖ Removed Assets (1)

Name	Size
.next/static/chunks/a1b36857c5d1da17.js	204.38 KB