Update ci.yml

Author: Harmanpreet-Microsoft

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ on:
   schedule:
     - cron: '0 8,20 * * *'  # Runs at 8:00 AM and 8:00 PM GMT
   workflow_dispatch:
+  pull_request:
+    branches-ignore:
+      - '**'
 
 permissions:
   contents: read