feat(devshell): add tufted, a Fennel TFTP server

This is useful for in-memory testing of APs connected over a simple
network.

In the future, we may use a TFTP server for field recovery by
configuring all our APs to use a certain known IPv4 address for the TFTP
server and ensuring that we always have a router on the untagged area
answering TFTP requests to reboot an AP in a known configuration,
without any serial console attached.

Signed-off-by: Ryan Lahfa <ryan@dgnum.eu>

default.nix

@@ -120,6 +120,9 @@ in
       (pkgs.callPackage (sources.liminix + "/pkgs/min-copy-closure") { nix = pkgs.lix; })
       # Daemon-less garbage collection for Liminix systems.
       (pkgs.callPackage (sources.liminix + "/pkgs/min-collect-garbage") { nix = pkgs.lix; })
+      # TFTP server, friendly for Nix builds.
+      (pkgs.callPackage (sources.liminix + "/pkgs/tufted") { })
+
       (pkgs.callPackage ./lib/colmena {
         colmena = pkgs.callPackage "${sources.colmena}/package.nix" { };
       })