fix: run other k3s clusters as kubevirt quests, use the interface provided by kubevirt

lib/genKubeVirtGuestModule.nix

@@ -0,0 +1,33 @@
+{
+  pkgs,
+  hostName,
+  networking,
+  ...
+}: let
+  inherit (networking.hostsAddr.${hostName}) iface;
+in {
+  # supported file systems, so we can mount any removable disks with these filesystems
+  boot.supportedFilesystems = [
+    "ext4"
+    "btrfs"
+    "xfs"
+    "fat"
+    "vfat"
+    "exfat"
+  ];
+
+  networking = {
+    inherit hostName;
+    inherit (networking) defaultGateway nameservers;
+    inherit (networking.hostsInterface.${hostName}) interfaces;
+    networkmanager.enable = false;
+  };
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "23.11"; # Did you read the comment?
+}