add rackserv vps configuration

sys/machines/rackserv/default.nix

@@ -0,0 +1,42 @@
+{
+  lib,
+  pkgs,
+  inputs,
+  systemProfiles,
+  specialArgs,
+  self,
+  ...
+}: {
+  imports =
+    [
+      "${inputs.nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
+      inputs.impermanence.nixosModules.impermanence
+      inputs.disko.nixosModules.disko
+      ./disk-config.nix
+    ]
+    ++ (map (x: systemProfiles + x) [
+      /core/security.nix
+      /core/tools.nix
+      /core/ssh.nix
+      /core/deploy.nix
+
+      /nix/default.nix
+
+      /network/tailscale.nix
+      /network/networkd.nix
+    ]);
+
+  boot.loader.grub = {
+    efiSupport = true;
+    efiInstallAsRemovable = true;
+  };
+
+  hardware.enableRedistributableFirmware = true;
+
+  environment.persistence."/persist".enable = false;
+
+  networking.hostName = "rackserv";
+
+  nixpkgs.hostPlatform.system = "x86_64-linux";
+  system.stateVersion = "25.05";
+}