create top-level package.json for github workflow

Author: lihebi

.github/workflows/node.js.yml

@@ -12,7 +12,6 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     strategy:
@@ -21,12 +20,10 @@ jobs:
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
-      working-directory: ./app
-      with:
-        node-version: ${{ matrix.node-version }}
-        cache: 'npm'
-    - run: npm run build:all
-      working-directory: ./app
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "npm"
+      - run: npm run build:all