Allow joining multiple cloudron servers together on the same domain

[imnotjack91]

the use case for this would be to use a secondary computer as like a slave of the first to split up the resource consumption. for instance, if i had a stack of old laptops, and a desktop i can throw several TB of storage in, i can use the desktop as a storage server and use the laptops together to host many other services like minecraft or rust or valheim servers and i can split them up accross the several machines so all that isnt hitting the same machine. or at least it doesnt have to.

[girish]

@imnotjack91 Indeed, this is planned for Cloudron 7 - https://forum.cloudron.io/topic/4423/what-s-coming-in-cloudron-7-0