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";
+}

sys/machines/rackserv/disk-config.nix

@@ -0,0 +1,52 @@
+{lib, ...}: {
+  disko.devices = {
+    disk.disk1 = {
+      device = lib.mkDefault "/dev/vda";
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          boot = {
+            name = "boot";
+            size = "1M";
+            type = "EF02";
+          };
+          esp = {
+            name = "ESP";
+            size = "500M";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+          root = {
+            name = "root";
+            size = "100%";
+            content = {
+              type = "lvm_pv";
+              vg = "pool";
+            };
+          };
+        };
+      };
+    };
+    lvm_vg = {
+      pool = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%FREE";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+              mountOptions = ["defaults"];
+            };
+          };
+        };
+      };
+    };
+  };
+}