universe/users/profiles/gpg.nix

{ config, ... }: {
  programs.gpg = {
    enable = true;
    homedir = "${config.xdg.dataHome}/gnupg";
  };

  services.gpg-agent = {
    enable = true;
    enableSshSupport = true;
    pinentryFlavor = "gnome";
  };
}