chore: rspress repo add diff CI

Author: yifancong

.github/workflows/diff.yml

@@ -2,7 +2,9 @@ name: Diff
 
 on:
   pull_request:
-    types: [opened, synchronize, reopened, closed]
+    branches: [main]
+  push:
+    branches: [main]
 
 jobs:
   Build:
@@ -45,4 +47,4 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           file_path: 'website/doc_build/web/rsdoctor-data.json'
-          target_branch: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref || github.event.repository.default_branch }}
+          target_branch: 'main'