add ci for next.js

.github/workflows/rowboat-build.yml

@@ -0,0 +1,27 @@
+name: Rowboat Next.js Build
+
+on:
+  pull_request:
+    paths:
+      - 'apps/rowboat/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - 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
+        working-directory: apps/rowboat
+        
+      - name: Build Rowboat
+        run: npm run build
+        working-directory: apps/rowboat