Sync drone remotes after bootstrapping

[Thaodan]

While using borg with multiple machines I noticed for my self that it is tedious to deal with adding my forks remote when I changed a drone.

It would be great if borg would have a function to sync the remotes of a drone from .gitmodules to each drone.
Ideally the function would be called just before fetching submodules
so that fetching for these wont fails with something like Could not find <ref>.

[Thaodan]

I created a prototype of such a function:

(defun borg-sync-drone-remotes (&optional drone)
  "Sync drone remotes with optional DRONE."
  (interactive (list (if current-prefix-arg
                         (read-from-minibuffer "Drone: ")
                       nil)))
  (let (remote-added)
    (dolist (drone (or drone
                       (borg-clones)))
      (let* ((drone-remote (borg-get drone "remote"))
             (drone-remote-str (if drone-remote
                                   (split-string drone-remote " "))))
        (if drone-remote-str
            (let* ((drone-remote-name (car drone-remote-str))
                   (drone-remote-url (cadr drone-remote-str))
                   (default-directory (borg-worktree done)
                   (magit-remote-add-set-remote.pushDefault drone-remote-name))
              (if (file-exists-p default-directory)
                  (if (not (magit-remote-p drone-remote-name))
                      (magit-remote-add (car drone-remote-str) (cadr drone-remote-str)))
                (message (format "Drone %s is not active, populate first" drone)))))))))