[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3266: Add packaging for NixOS and test on CI

[Tahoe-LAFS]

#3266: Add packaging for NixOS and test on CI
-------------------------+---------------------------
 Reporter:  exarkun      |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  undecided
Component:  unknown      |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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 Make it easier for NixOS to maintain their Tahoe-LAFS package by keeping
 an up-to-date Nix expression for the Tahoe-LAFS package in the Tahoe-LAFS
 repo itself.

 Run this on CI so it keeps working as development continues.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3266>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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