remove nodejs setup from the ci workflow

.github/workflows/build.yml

@@ -8,10 +8,6 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Setup NodeJS
-      uses: actions/setup-node@v2
-      with:
-        node-version: '12'
     - name: Install NPM dependencies
       run: npm install
     - name: Build