Describe you feature request

Is your feature request related to a problem? Please describe.
I have the following configuration:

{
	frankenphp
	order php_server before file_server
	log {
        level DEBUG
    }
}

:443 {
	tls /cert/_wildcard.orb.local.pem /cert/_wildcard.orb.local-key.pem

	root * {$PUBLIC_DIR:/app/public}

	@has_xdebug_cookie header Cookie *XDEBUG_SESSION*

	route @has_xdebug_cookie {
		php_server {
			env XDEBUG_MODE "debug" <---- it doesn't work here :(
		}
	}

	route {
		php_server 
	}
}

To improve performance while developing an app, I'd like to provide a conditional xdebug enabling. I've noticed the XDebug Helper sets the XDEBUG_SESSION cookie. So, I know when I should do something (enable XDebug). However, I've noticed the only way to provide an additional .ini file is by setting an environment variable, which is not possible for me. I'm not sure if it is possible, but it would be great if I could provide an extra .ini file as a directive instead of an environment variable.

Describe the solution you'd like
Something like:

...
	route @has_xdebug_cookie {
		php_server {
			ini "some_path_to_my.ini"
		}
	}
...

Describe alternatives you've considered
n/a