Update test.yml

.github/workflows/test.yml

@@ -1,7 +1,9 @@
 name: Test
 
-on: [push]
-
+on: 
+  pull_request:
+    branches:
+      - master
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -30,9 +32,5 @@ jobs:
           sysctl hw.ncpu
           sysctl hw.physmem
           sysctl hw.usermem
-on:
-  pull_request:
-    # Sequence of patterns matched against refs/heads
-    branches:
-      - main
+