tmp: Enable search_index for PR

Author: DevinTDHa

.github/workflows/create_search_index.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - master
+  pull_request:
+    branches:
+      - master
 
 concurrency:
   # Make sure only workflow run at a time for create_search_index.yml