feat(bootloader): add enable option

modules/boot/default.nix

@@ -0,0 +1,18 @@
+{ lib, config, ... }:
+
+let
+  cfg = config.bootloader;
+in
+{
+  options.bootloader.enable = lib.mkEnableOption "system bootloader";
+
+  config = lib.mkIf cfg.enable {
+    boot = {
+      loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+      tmp.useTmpfs = config.host.highRam;
+    };
+  };
+}