Adding github action

.github/workflows/ensure-build.yml

@@ -0,0 +1,20 @@
+name: Ensure Site Builds Cleanly
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm test
+      - run: npm build