[bug#52659] Vorta GUI for Borg backup

[Leo Famulari]

Recently I noticed some discussion on #guix IRC about Vorta, a GUI for
Borg backup.

I actually have some ooooold patches for this, that I've been
maintaining privately for a while. I never submitted them because I
haven't been using Vorta, just Borg via cron.

But since I have this work, I might as well submit it since others are
asking about this program.

Please test!

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