RFC: Restrict user to specific --net/--vethname interfaces

[tartpvule]

Problem: I want to have a middle ground between "restricted-network yes" and "restricted-network no", where a regular user may attach to some but not all network interfaces/bridges.
What I did: Made a new feature to allow using "--net" or "--vethname" if specified with a prefix configured in "firejail.config" when "restricted-network yes".
I have implemented (draft) this feature on my fork. See: https://github.com/tartpvule/firejail/tree/draft-netprefix

Reading the CONTRIBUTING.md file, I don't know where to begin proposing new "firejail.config" settings.

Request For Comments, please.