Feature Request - Add support for Devuan

[kbhasi]

Describe the problem your feature request solves.

Devuan GNU/Linux is a fork of Debian GNU/Linux that aims to remove any dependencies on systemd from the latter, though it does end up lagging behind that when it comes to releases. However, not being dependent on this may translate to it being friendlier with chroot and proot environments.

Describe the solution you'd like

It may be possible to fork the Debian support repo and change a number of things to make it work with Devuan. However, I'm too busy with other things to be able to try this for myself.

Describe alternatives you've considered

I have tried to just set up a Debian filesystem and switch the APT sources to Devuan sources, but an error comes up about missing public keys. At this point, I would need to get the Devuan archive keyring right from the repository itself as a package, and install that, but that wouldn't be easy for others, so I decided to just stop there.

Edit: I found this guide and will try to follow that to get the archive keyring installed. As this isn't a full install, I wouldn't have to follow most of it.

[MatthewTighe]

Added to #581