Add simple workflow to build frontend code

.github/workflows/frontend.yaml

@@ -0,0 +1,24 @@
+# Run CI checks for frontend code
+name: Frontend CI
+
+on: ["push", "pull_request"]
+
+jobs:
+  frontend:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+      - name: Install Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "14"
+      - name: Install Deps
+        run: |
+          cd src/frontend
+          npm install
+      - name: Build Frontend
+        run: |
+          cd src/frontend
+          npm run build