nixos/lxd: add virtual-machine support, image and module

nixos/maintainers/scripts/lxd/lxd-container-image-inner.nix

@@ -0,0 +1,20 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, lib, ... }:
+
+{
+  imports =
+    [
+      # Include the default lxd configuration.
+      ../../../modules/virtualisation/lxc-container.nix
+      # Include the container-specific autogenerated configuration.
+      ./lxd.nix
+    ];
+
+  networking.useDHCP = false;
+  networking.interfaces.eth0.useDHCP = true;
+
+  system.stateVersion = "21.05"; # Did you read the comment?
+}