Create a new API key. If no API key exists yet, or all tokens for existing API keys have
been lost, the application container can be TEMPORARILY started with the
API_KEY_CREATE environment variable set to string "true" and the application will
create a new API key when starting and print the corresponding token to the logs.
API keys created using the environment variable mechanism should only be used to
boostrap the creation of other - more secure - API keys and be discarded.