Update home impermanence to be in the style of GNU Stow

modules/home/services/gpg/default.nix

@@ -1,7 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   services.gpg-agent = {
     enable = true;
     enableSshSupport = true;
   };
+
+  home.persistence."${config.xdg.userDirs.extraConfig.XDG_PERSIST_DIR}".directories = [ "secure/.gnupg" ];
 }