Add initial legacy configuration

nixos-configurations/ochsenchopf/default.nix

@@ -0,0 +1,38 @@
+{ ... }:
+{
+
+  imports = [
+    ./filesystems.nix
+    ./networking.nix
+
+    # TODO: Hardware
+
+  ];
+
+  nixpkgs.hostPlatform = "x86_64-linux";
+
+  virtualisation = {
+    # TODO: This should probably be somewhere else.
+    docker = {
+      enable = true;
+      enableOnBoot = false;
+    };
+    libvirtd.enable = true;
+    spiceUSBRedirection.enable = true;
+  };
+  users.extraUsers.fhauser.extraGroups = [ "libvirtd" ];
+
+  boot.extraModprobeConfig = ''
+    options kvm_intel nested=1
+    options kvm_intel emulate_invalid_guest_state=0
+    options kvm ignore_msrs=1
+  '';
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like fi:le 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 = "24.05"; # Did you read the comment?
+}