update ssh-key

modules/home-manager.nix

@@ -33,6 +33,7 @@ in
       Unit.Description = "ssh-cert-dist service for ${path}";
       Timer = {
         OnCalendar = options.interval;
+        Persistent = true;
         Unit = "${options.name}.service";
       };
       Install.WantedBy = [ "timers.target" ];