Update and rename pull_request.yml to build_check.yml

Author: lm2343635

.github/workflows/pull_request.yml renamed to .github/workflows/build_check.yml

@@ -1,14 +1,18 @@
-name: pull_request_build_check
+name: build_check
 
-on: [pull_request]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   build:
 
     runs-on: macOS-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Pod install
       run: pod install --project-directory=Example --repo-update
     - name: Run test