Steps to reproduce the issue

Download Joomla 4 beta 6
DONT INSTALL JOOMLA
run

php cli/joomla.php

Expected result

No errors. Maybe a message to install Joomla before using cli - or the ability to install Joomla using the CLI

Actual result

PHP Warning:  Undefined array key "REQUEST_URI" in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23

Warning: Undefined array key "REQUEST_URI" in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23
PHP Warning:  Undefined array key "REQUEST_URI" in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23

Warning: Undefined array key "REQUEST_URI" in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23
PHP Warning:  Cannot modify header information - headers already sent by (output started at /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php:23) in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23

Warning: Cannot modify header information - headers already sent by (output started at /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php:23) in /Users/phil/Downloads/Joomla_4.0.0-beta6-Beta-Full_Package/includes/framework.php on line 23

System information (as much as possible)

PHP 7.4.13 (cli) (built: Dec 23 2020 11:21:05) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.13, Copyright (c), by Zend Technologies

Additional comments