fix: update pull request trigger to listen for 'main' branch instead of 'next'

Author: odinr

.github/workflows/app-test.yml

@@ -1,11 +1,12 @@
 permissions:
   contents: read
+
 name: App Test
 
 on:
   pull_request:
     branches:
-      - next
+      - main
   release:
     types:
       - published