ci: only run push when on main branch

Signed-off-by: Seren_Modz 21 <seren@kings-world.net>

.github/workflows/build.yml

@@ -1,6 +1,10 @@
 name: Build Project
 
-on: [push, pull_request]
+on: 
+  pull_request: 
+  push:
+    branches:
+      - main
 
 jobs:
   build: