feat: add nix server provision

hosts/vps1/hardware-configuration.nix

@@ -0,0 +1,10 @@
+{ lib, ... }:
+{
+  # Replace this file with the generated hardware config from the target host.
+  fileSystems."/" = lib.mkDefault {
+    device = "/dev/disk/by-label/nixos";
+    fsType = "ext4";
+  };
+
+  swapDevices = [ ];
+}