Location and Name of CI v4 .env File

I prefer to ONLY have common Local and Remote .env settings and use the following to test and modify app/config/ files:

PHP Code:

<?php // index.php
defined('LOCALHOST')
?:
define('LOCALHOST', 'localhost'===$_SERVER['SERVER_NAME']);

// app/Config/Database.php
public $default = [
'DSN'      => '',
'hostname' => 'localhost',
'username' => LOCALHOST ? 'localuser'     : 'onlineuser',
'password' => LOCALHOST ? 'localpassword' : 'onlinepassword',
'database' => 'mydbname',
'DBDriver' => 'MySQLi', 
...