chore: add rsdoctor diff action

[yifancong]

Summary

Related links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspack canceled.

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[Copilot]

Pull Request Overview

This PR adds Rsdoctor diff action functionality to the reusable build-test workflow to track and report build size changes.

• Integrates rsdoctor-action to monitor bundle size differences
• Clones an external demo repository for analysis
• Configures automated reporting on pull requests

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Using @main for the action version is a security and stability risk. The action could change unexpectedly, breaking the workflow or introducing malicious code.

Pin to a specific version or commit SHA:

uses: web-infra-dev/[email protected]  # or specific commit SHA

Suggested change

	uses: web-infra-dev/rsdoctor-action@main
	uses: web-infra-dev/rsdoctor-action@v1.0.0

[Copilot]

The target branch "chore/diff-v2" is hardcoded, which means this workflow will always compare against the same branch regardless of the actual PR base branch. This will produce incorrect comparisons for PRs targeting different branches.

Consider making this configurable or using a dynamic value like ${{ github.base_ref }} to automatically use the PR's target branch.

Suggested change

	target_branch: "chore/diff-v2"
	target_branch: ${{ github.base_ref }}

[Copilot]

These rsdoctor diff steps run unconditionally for all test matrix combinations (different Node versions and targets). This means the same rsdoctor analysis will be executed multiple times unnecessarily, wasting CI resources and potentially causing conflicts.

Add a condition to run only once, for example:

- name: Clone rspack-diff-minimal
  if: ${{ matrix.node == '20' && inputs.target == 'x86_64-unknown-linux-gnu' }}
  run: git clone https://github.com/yifancong/rspack-diff-minimal.git

Apply the same condition to all rsdoctor-related steps (lines 149-162).

[Copilot]

The git clone command uses SSH protocol ([email protected]:), which will fail in GitHub Actions without SSH key configuration. There's no SSH key setup in the workflow, so this step will fail with an authentication error.

Replace with HTTPS protocol:

run: git clone https://github.com/yifancong/rspack-diff-minimal.git

Suggested change

	run: git clone git@github.com:yifancong/rspack-diff-minimal.git
	run: git clone https://github.com/yifancong/rspack-diff-minimal.git

[github-actions]

📦 Binary Size-limit

Comparing 5661b90 to feat: support SRI with experiments.css and CssExtractRspackPlugin (#12239) by harpsealjs

🙈 Size remains the same at 47.63MB

[codspeed-hq]

CodSpeed Performance Report

Merging #12256 will degrade performances by 20.12%

_{Comparing chore/add-rsdoctor-diff-actoin (5661b90) with main (5322cc8)¹}

Summary

❌ 1 regression
✅ 16 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	js@record chunk group	83.3 µs	104.3 µs	-20.12%

Footnotes

1. No successful run was found on chore/diff-v2 (e488009) during the generation of this report, so main (5322cc8) was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩