Add demo server nixos configuration

nix/demo-server/default.nix

@@ -0,0 +1,48 @@
+{ pkgs, ... }:
+{
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+    };
+    kernelPackages = pkgs.linuxPackages_latest;
+  };
+
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+
+  time.timeZone = "Europe/Amsterdam";
+
+  nixpkgs.config.allowUnfree = true;
+
+  networking.networkmanager.enable = true;
+
+  networking.hostName = "archtika-demo-server";
+
+  users = {
+    mutableUsers = false;
+    users = {
+      root.hashedPassword = "$y$j9T$MuWDs5Ind6VPEM78u5VTy/$XAuRCaOPtS/8Vj8XgpxB/XX2ygftNLql2VrFWcC/sq7";
+      thiloho = {
+        isNormalUser = true;
+        extraGroups = [
+          "wheel"
+          "networkmanager"
+        ];
+        hashedPassword = "$y$j9T$Y0ffzVb7wrZSdCKbiYHin0$oahgfFqH/Eep6j6f4iKPETEfGZSOkgu74UT2eyG2uI1";
+        openssh.authorizedKeys.keys = [
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBj6+r+vMXJyy5wvQTLyfd2rIw62WCg9eIpwsciHg4ym thiloho@pc"
+        ];
+      };
+    };
+  };
+
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = false;
+  };
+
+  system.stateVersion = "24.11";
+}