Merge pull request #6 from niyrme/ci-fix

Fix CI running all actions twice on PR

.github/workflows/ci.yml

@@ -1,5 +1,8 @@
 name: CI
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+    branches: [ master ]
 
 jobs:
   build-linux-gcc: