on_startup.sh

#!/bin/bash
# Write some commands here that will run on root user before startup.
# For example, to clone transformers and install it in dev mode:
# git clone https://github.com/huggingface/transformers.git
# cd transformers && pip install -e ".[dev]"

# Add dark theme
mkdir -p ~/.jupyter/lab/user-settings/@jupyterlab/apputils-extension/ && \
    echo '{ "theme":"JupyterLab Dark" }' >  ~/.jupyter/lab/user-settings/@jupyterlab/apputils-extension/themes.jupyterlab-settings