Fix SSH identities bug

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/installer/users/nick/configs/console/ssh/default.nix

@@ -43,18 +43,21 @@ in
           hostname = "karaolidis.com";
           user = "nick";
           identityFile = "${home}/.ssh/ssh_personal_ed25519_key";
+          identitiesOnly = true;
         };
 
         "github.com" = {
           hostname = "github.com";
           user = "git";
           identityFile = "${home}/.ssh/ssh_personal_ed25519_key";
+          identitiesOnly = true;
         };
 
         "gitlab.com" = {
           hostname = "gitlab.com";
           user = "git";
           identityFile = "${home}/.ssh/ssh_personal_ed25519_key";
+          identitiesOnly = true;
         };
       };