adds trigger to run workflow

sunny4381 · sunny4381 · commit d0904a23c95f · 2021-09-04T17:40:41.000+09:00
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build:
