init k3s config

not finished but a pointer in the right direction

modules/nixos/common/k3s.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib)
+    types
+    mkIf
+    mkOption
+    mkEnableOption
+    ;
+  cfg = config.kub;
+in
+{
+  options.kub = {
+    enable = mkEnableOption "enable k3s";
+    role = mkOption {
+      type = types.enum [
+        "server"
+        "agent"
+      ];
+      default = "agent";
+    };
+    leaderAddress = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+    };
+    tokenFile = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      description = "File path containing k3s token to use when connecting to the server.";
+      default = config.sops.secrets.k3s-token.path or null;
+    };
+  };
+  config = mkIf cfg.enable {
+    sops.secrets.k3s-token = { };
+    services = {
+      k3s = {
+        enable = true;
+        clusterInit = mkIf (cfg.role == "server") true;
+      };
+    };
+  };
+}