Resolve "Cannot run nomad oasis with the new build system"

Closes #1219 (closed)

• the north container is missing /app/nomad/jupyterhub_config.py and /app/dependencies/nomad-remote-tools-hub/tools.json
• the app container tries to import asgiref. Its in the pyproject.toml. But for some reason not installed in the final image
• when you try to use the dev image instead, problems arise because the /app folder and all files belong to root and not to nomad/1000