Add test and build ci workflow.

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: Test and Build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "14"
+
+      - name: Cache Node.js modules
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.OS }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.OS }}-node-
+            ${{ runner.OS }}-
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Run Tests
+        run: npm test
+
+      - name: Build
+        run: npm run build