feat: add riscv64 cluster - rolling girls

lib/colmenaSystem.nix

@@ -4,15 +4,16 @@
   home-manager,
   specialArgs,
   nixos-modules,
-  home-module,
+  home-module ? null,
   host_tags,
+  targetUser ? specialArgs.username,
 }: let
   username = specialArgs.username;
 in
   { name, nodes, ... }: {
     deployment = {
       targetHost = name;  # hostName or IP address
-      targetUser = username;
+      targetUser = targetUser;
       tags = host_tags;
     };
 
@@ -26,7 +27,7 @@ in
           environment.etc."nix/inputs/nixpkgs".source = "${nixpkgs}";
           nix.nixPath = ["/etc/nix/inputs"];
         }
-
+      ] ++ (if (home-module != null) then [
         home-manager.nixosModules.home-manager
         {
           home-manager.useGlobalPkgs = true;
@@ -35,5 +36,5 @@ in
           home-manager.extraSpecialArgs = specialArgs;
           home-manager.users."${username}" = home-module;
         }
-      ];
+      ] else []);
   }