Don't run tests on branches

This causes the checks to run on branches and then again on PRs

Author: zetter-rpf

.github/workflows/ci.yml

@@ -1,8 +1,12 @@
 name: CI
 
 on:
-  pull_request:
   push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - "**"
 
 permissions:
   contents: read