chore(ci): ci to skip when changes are limited to workflow config files

Author: zhumin8

.github/workflows/ci.yaml

@@ -17,7 +17,11 @@ on:
   push:
     branches:
     - main
+    paths-ignore:
+    - '.github/workflows/**'
   pull_request:
+    paths-ignore:
+    - '.github/workflows/**'
 name: ci
 jobs:
   # detect whether or note we should run "bulk" (non-handwritten) unit tests