added hostname configuration

modules/core/config.nix

@@ -9,8 +9,9 @@ let
   allowRootSSH = if cfg.ssh.permitRootLogin then "yes" else "no";
 in
 {
-
   config = {
+    networking.hostName = cfg.hostname;
+
     boot = {
       kernelPackages = shared.kernelOptions.${cfg.kernel};
       loader = {

modules/core/options.nix

@@ -5,6 +5,12 @@
 }:
 {
   options.homelab.core = {
+    hostname = lib.mkOption {
+      type = lib.types.str;
+      default = "nixos";
+      description = "Hostname of the machine";
+    };
+
     kernel = lib.mkOption {
       type = with lib.types; enum (builtins.attrNames shared.kernelOptions);
       default = "lts";