add github ci

Author: KaimingTao

app/.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install Python dependencies
+        run: python3 -m pip install --user pyyaml
+
+      - name: Build
+        run: npm run build