[jupyterhub] Allow persistent user settings and workspaces via /data/home

jupyterhub/base/Dockerfile

@@ -71,8 +71,8 @@ RUN mkdir -p ~/.venv && \
     ipython kernel install --user --name=robofish
 
 COPY jupyter_notebook_config.py /root/.jupyter/
-COPY themes.jupyterlab-settings /root/.jupyter/lab/user-settings/@jupyterlab/apputils-extension/
-COPY commands.jupyterlab-settings /root/.jupyter/lab/user-settings/@jupyterlab/codemirror-extension/
+ENV JUPYTERLAB_SETTINGS_DIR=/data/home/.config/jupyter/lab/user-settings
+ENV JUPYTERLAB_WORKSPACES_DIR=/data/home/.config/jupyter/lab/workspaces
 
 RUN chmod -x /etc/update-motd.d/*
 RUN mkdir /data

jupyterhub/base/jupyter_notebook_config.py

 c.NotebookApp.allow_root = True
-c.NotebookApp.terminado_settings = { 'shell_command': ['/bin/bash', '-l'] }
-c.MultiKernelManager.default_kernel_name = 'robofish'
-c.NotebookApp.notebook_dir = '/data'
+c.NotebookApp.terminado_settings = {"shell_command": ["/bin/bash", "-l"]}
+c.MultiKernelManager.default_kernel_name = "robofish"
+c.NotebookApp.notebook_dir = "/data"