By itself, this module does little. See for instance the
``mail_environment`` addon which depends on this one to allow configuring
the incoming and outgoing mail servers depending on the environment.

You can store your configuration values in a companion module called
``server_environment_files``. You can copy and customize the provided
``server_environment_files_sample`` module for this purpose. Alternatively, you
can provide them in environment variables ``SERVER_ENV_CONFIG`` and
``SERVER_ENV_CONFIG_SECRET``.