Add a snes emulator.

nix/configuration/roles/gpg/default.nix

@@ -2,6 +2,7 @@
   config,
   lib,
   pkgs,
+  pkgs-unstable,
   ...
 }:
 
@@ -88,4 +89,11 @@
     pcsctools
   ];
 
+  nixpkgs.overlays = [
+    (final: prev: {
+      gnupg = pkgs-unstable.gnupg;
+      scdaemon = pkgs-unstable.scdaemon;
+    })
+  ];
+
 }