chore: add ci to user-agent branch

Author: jeqo

.github/workflows/prs_and_commits.yml

@@ -28,7 +28,9 @@ on:
   pull_request:
     branches: [ main ]
   push:
-    branches: [ main ]
+    branches:
+      - main
+      - aiven-user-agent
 
 # Disallow concurrent runs for the same PR by cancelling in-progress runs
 # when new commits are pushed