ci: build and test react app

.github/workflows/build_test_react.yml

@@ -0,0 +1,20 @@
+name: Build and test React app
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+jobs:
+  build_test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '16'
+        check-latest: true
+        cache: 'npm'
+    - run: npm ci
+    - run: npm run build
+    - run: npm test