chore(ci): optimize the diff action

Author: yifancong

.github/workflows/ci-diff.yml

@@ -3,13 +3,14 @@ name: CI Diff
 on:
   pull_request:
     types: [opened, synchronize, reopened]
+    # Ignore md files in PR to skip workflow when only documentation changes
+    paths-ignore:
+      - "**/*.md"
+      - "website/**"
 
   push:
     branches:
       - main
-    paths-ignore:
-      - "**/*.md"
-      - "website/**"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}