chore: add rsdoctor diff action

Author: yifancong

.github/workflows/reusable-build-test.yml

@@ -148,6 +148,13 @@ jobs:
       run:
         shell: bash
     steps:
+      - name: Clone rspack-diff-minimal
+        run: git clone git@github.com:yifancong/rspack-diff-minimal.git
+
+      - name: Install dependencies
+        working-directory: rspack-diff-minimal
+        run: pnpm install
+
       - name: Build project
         working-directory: rspack-diff-minimal
         run: pnpm run build