init k3s config

not finished but a pointer in the right direction

configurations/nixos/kube-main-tofu/default.nix

@@ -0,0 +1,28 @@
+{
+  flake,
+  config,
+  ...
+}:
+
+let
+  inherit (flake) inputs;
+  inherit (inputs) self;
+in
+{
+  imports = [
+    self.nixosModules.default
+  ];
+  deploy = {
+    enable = false;
+  };
+  kub = {
+    enable = true;
+    role = "server";
+  };
+  networking = {
+    hostName = "kube-main-tofu";
+  };
+  environment.systemPackages = [
+  ];
+  system.stateVersion = "25.05";
+}