Add notebook v6 workflow

.github/workflows/build.yml

@@ -7,7 +7,8 @@ on:
     branches: '*'
 
 jobs:
-  build:
+  lab-build-test:
+    name: JupyterLab Build
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
@@ -48,3 +49,30 @@ jobs:
       run: |
         jlpm && jlpm build
         jlpm run test
+
+  classic-notebook:
+    name: Notebook v6 Build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Install Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+        architecture: 'x64'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install "notebook<7"
+
+    - name: Install the extension
+      run: |
+        jupyter nbextension install --sys-prefix --symlink --overwrite --py voila_gridstack
+        jupyter nbextension enable --sys-prefix --py voila_gridstack
+
+    - name: Check the extensions are installed
+      run: |
+        jupyter nbextension list 2>&1 | grep -ie "voila-gridstack/extension.*enabled" -