Minor update

modules/darwin/default.nix

@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 let
-  emacsOverlaySha256 = "1smprpp3zqh04jdv0b7ibc69n025j1bnpp76lnwyvidilf055g2h";
+  emacsOverlaySha256 = "1kl9hid28adcnb1y6cfi63jqmhypa31iknnnz3sp6szhkf30j1az";
 in
 {
   home-manager.backupFileExtension = "nix-backup";

modules/darwin/home-manager.nix

@@ -192,6 +192,9 @@ in
                 controlMaster = "no";
                 controlPath = "~/.ssh/master-%r@%n:%p";
                 controlPersist = "no";
+                preferredAuthentications = "publickey";
+                identityAgent = "~/.gnupg/S.gpg-agent.ssh";
+                identityFile = "none";
               };
               "moonunit.kolkman.org" = {
                 hostname = "moonunit.kolkman.org";