Update build.yml

.github/workflows/build.yml

@@ -2,9 +2,9 @@ name: Build
 
 on:
   push:
-    branches: [ "**" ]
+    branches: [ "master" ]
   pull_request:
-    branches: [ "**" ]
+    branches: [ "master" ]
 
 jobs:
   build:
@@ -25,4 +25,4 @@ jobs:
         cache: 'npm'
     - run: npm ci
     - run: npm run build --if-present
-    - run: npm run test --if-present
+    - run: npm run test --if-present