Add CI workflow on PR

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+        with:
+          path: checkout-prefix
+      - name: Use Node.js 20.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+      - name: Install dependencies
+        run: npm install
+        working-directory: checkout-prefix
+      - name: Build
+        run: npm run build
+        working-directory: checkout-prefix
+      - name: Run linter
+        run: npm run lint
+        working-directory: checkout-prefix