Add docs about overriding host with host file

This MR adds a note to set-up-gdk.md about using ./host file to override host the workhorse process will bind to.

This is especially useful when someone uses GDK inside the Docker container and wants to expose Workhorse.

Status changed to closed

Okay, I've found it in howto/local_network.md. I expected to find it in the same place echo 4000 > port is documented.

Anyway, I'm closing this MR then.

@grzesiek I think this is actually a good idea.

Status changed to reopened

@jacobvosmaer-gitlab feel free to reopen and merge if you decide that this part of documentation can be duplicated and it makes sense to have it in both places, otherwise source branch can be safely removed

Status changed to merged

mentioned in commit 87fe51ab

@jacobvosmaer-gitlab Thanks