Feature request: Option to append to `docker-desktop` `vm.fileSharing`

[kbakk]

Currently, the option that exist is:

ctlptl docker-desktop set vm.fileSharing /Users,/Volumes,/private,/tmp

In order to use this, you need to know what's there already, not to overwrite it. If the list is long, it's cumbersome to copy-paste all the values, to add a new value.

It would be nice with a command like

ctlptl docker-desktop append vm.fileSharing /tmp

which would (if not already in the list) append /tmp to the list.

[nicks]

I like this idea!