populate ip address based on hostname and populate the hostfile with other vm ips

nixos/roles/hostmap.nix

@@ -16,6 +16,8 @@
   "192.168.0.26" = ["toth"];
   "192.168.0.27" = ["ithaqua"];
   "192.168.0.28" = ["nyarlathotep"];
+  "192.168.0.29" = ["nixos-installer"];
   "192.168.0.30" = ["cthugha"];
+  "192.168.0.40" = ["nerf-nixos-testlab"];
   "192.168.0.92" = ["sanctamariamaterdei"];
 }