nixos-config/modules/home/services/gpg/default.nix

{ config, ... }:
{
  services.gpg-agent = {
    enable = true;
    enableSshSupport = true;
  };

  home.persistence."${config.xdg.userDirs.extraConfig.XDG_PERSIST_DIR}".directories = [ "secure/.gnupg" ];
}