add browser check

.github/workflows/build.yml

@@ -172,7 +172,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 15
     steps:
-      - name: Install Python
+      - name: Install Python with Homebrew
         run: |
           brew install python
       - uses: actions/download-artifact@v3
@@ -198,6 +198,9 @@ jobs:
           jupyter server extension list 2>&1 | grep -ie "notebook.*enabled" -
           jupyter notebook --version
           jupyter notebook --help
+      - name: Browser check
+        run: |
+          python -m jupyterlab.browser_check --BrowserApp.default_url='/tree'
 
   check_links:
     runs-on: ubuntu-latest