Fix when to run GitHub Actions

Author: koba-e964

.github/workflows/format.yml

@@ -1,6 +1,10 @@
 name: format
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+  pull_request:
 
 jobs:
   format:

.github/workflows/test.yml

@@ -1,6 +1,10 @@
 name: test
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+  pull_request:
 
 jobs:
   test:

.github/workflows/verify.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
     - master
+  pull_request:
 
 jobs:
   verify: