Generating Database Configuration File

The link I gave you is not to identify the environment of the application, but to load the configuration without being messing around with the config files directly. Also, you could create a system hook to check for that .env file existence and/or it's structure to know if you should redirect the request to a install controller.

That controller is the one who handles that installation process. You could create a method for each necessary step (app config, db config, etc).

Best regards,
José Postiga
Senior Backend Developer