When the docker-migrid stack is launched from scratch, the underlying `~/state/user_db_home/MiG-users.db' is only created
when the $USERNAME and $PASSWORD variables are non-empty during the run of the docker-entry.sh launch script.

If these are not set, the following command is not executed, which ensures that this database is created.

This causes the deployment to not being able to signup/login users because the lookup for the expected database will fail.

Potential steps to resolves this could be.

• Move the current initialise call is always run as part of the docker-entry.sh execution.
• Potentially introduce a specific inituserdb.py script as suggested by @jonasbardino that handles this database initialisation such that we don't have to rely on leveraging the migrateusers.py script for this.