server-env/server_environment/readme/INSTALL.md

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.