chore: Update targets for tests.yml

Signed-off-by: Roger Barker <roger.barker@swirldslabs.com>

Author: rbarker-dev

.github/workflows/tests.yml

@@ -2,8 +2,9 @@ name: Tests CI
 
 on:
   push:
+  pull_request:
     branches:
-      - '**'
+      - "main"
   workflow_dispatch:
 
 concurrency: