build: rm yarn, consolidate workflow

Author: longlho

.github/workflows/node.js.yml

@@ -3,11 +3,7 @@
 
 name: Node.js CI
 
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -24,6 +20,6 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - run: yarn
-    - run: yarn build
-    - run: yarn test
+    - run: npm ci
+    - run: npm run build
+    - run: npm t