Add deployment workflow

.github/workflows/nodejs.yml

@@ -3,18 +3,31 @@ name: Node CI
 on: [push]
 
 jobs:
-  test:
+  build:
 
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v1
-    - uses: actions/setup-node@v1
+    - name: Setup Node.js 12.x
+      uses: actions/setup-node@v1
       with:
         node-version: 12.x
-    - name: npm install and test
+
+    - name: Install and test
       run: |
         npm ci
         npm test
       env:
         CI: true
+
+    - name: Build
+      run: |
+        npm run  build
+
+    - name: Deploy
+      uses: JamesIves/github-pages-deploy-action@releases/v3
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        BRANCH: gh-pages
+        FOLDER: dist