ci: don't run twice on local PR

This is silly..

Link: https://github.com/orgs/community/discussions/57827

Author: martinetd

.github/workflows/ci.yml

@@ -6,6 +6,7 @@ on:
             - edited
             - synchronize
     push:
+        branches: ["master", "test"]
 
 env:
   RUSTFLAGS: "-Dwarnings"