init nix-os configuraion files

modules/nixos/virtualize/docker.nix

@@ -0,0 +1,11 @@
+{ config, pkgs, lib, username, ... }:
+{
+  # Enable Docker
+  virtualisation.docker.enable = true;
+
+  # Enable Podman
+  # virtualisation.podman.enable = true;
+  #virtualisation.podman.dockerCompat = true; # Create a `docker` alias for podman, to use it as a drop-in replacement
+
+  users.users.${username}.extraGroups = lib.mkIf config.virtualisation.docker.enable [ "docker" ];
+}