Create build.yml for testing PRs

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: Build test
+on:
+  workflow_dispatch:        # can be triggered manually
+  pull_request:             # and for PRs
+jobs:  
+  build_site:    
+    runs-on: ubuntu-latest    
+    steps:      
+      - name: Checkout        
+        uses: actions/checkout@v4
+      - name: Install Node.js        
+        uses: actions/setup-node@v4        
+        with:          
+          node-version: 20          
+          cache: npm
+      - name: Install dependencies        
+        run: npm install
+      - name: build        
+        env:          
+          BASE_PATH: '/${{ github.event.repository.name }}'        
+        run: |
+          npm run build