Added node.js 12.x setup step

.github/workflows/build.yaml

@@ -16,12 +16,15 @@ jobs:
   build:
     # The type of runner that the job will run on
     runs-on: ubuntu-latest
-
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
     - uses: actions/checkout@v2
-
+    # Setup .npmrc file to publish to npm
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+        registry-url: 'https://registry.npmjs.org'
     # Runs a single command using the runners shell
     - run: npm install
     - run: npm run build