Support loading traitlet configs from environment variables #409
Description
Traitlets has supported the loading of configurations from environment variables since version 5.14.0 - https://traitlets.readthedocs.io/en/stable/changelog.html#id9 .
Can we enable loading of the config from environment variables for the JupyterApp application? I think we just need to call the load_config_environ from the initialize method.