nixos/hosts/common/optional/docker/default.nix

{ pkgs, inputs, ... }:
{

  imports = [ inputs.arion.nixosModules.arion ];
  environment.systemPackages = [
    pkgs.arion
  ];

  # Arion works with Docker, but for NixOS-based containers, you need Podman
  # since NixOS 21.05.
  virtualisation = {
    podman = {
      enable = true;
      defaultNetwork.settings.dns_enabled = true;
    };
    docker = {
      enable = true;
      storageDriver = "btrfs";
      rootless = {
        enable = true;
        setSocketVariable = true;
      };
    };
  };

}