text: Title: Add the ability to create an admin user from environment variables
  Body: Hey ! Hope you're doing well, I wanted to know if it's possible to include admin default admin credentials. Especially with environment variables like `ADMIN_EMAIL=<email>` and `ADMIN_PASSWORD=<secret>`. Why with environment variables? Because in some cases, users might need to deploy shynet on a docker instance without having shell access. Environment variables are common knowledge and does not require knowing Django Admin.
  
  What do you think of this approach? And do you have any ideas on how to integrate it into shynet (as a workaround to avoid having to use the instance shell) ? I'm thinking of adding this administrator login at startup. 
  
  Thank you for your time and this quality project. Have a nice day!