default: set some systemd-boot params

config/default.nix

@@ -16,11 +16,16 @@
   ];
 
   boot = {
-    tmp.cleanOnBoot = true;
+    loader.systemd-boot = {
+      configurationLimit = lib.mkDefault 10;
+      editor = false;
+      graceful = true;
+    };
     kernel.sysctl = {
       "kernel.panic" = 60; # reset 60 seconds after a kernel panic
       "net.ipv4.tcp_congestion_control" = "bbr";
     };
+    tmp.cleanOnBoot = true;
     # recommend to turn off, only on by default for backwards compatibility
     zfs.forceImportRoot = false;
   };