Update pages.yml

Author: eonarheim

.github/workflows/pages.yml

@@ -32,14 +32,14 @@ jobs:
             ${{ runner.os }}-node-
 
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
       - name: Setup Pages
         uses: actions/configure-pages@v5
 
       - name: Build
         run: |
-          npm run build
+          npm run build -- --base=sample-excalitris
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3