configuration.nix

  boot.loader = {
    efi = {
      canTouchEfiVariables = true;
      efiSysMountPoint = "/boot"; # Same as in hardware-configuration.nix
    };
    grub = {
        enable = true;
        efiSupport = true;
        device = "nodev";

        memtest86.enable = true;

        extraFiles = {
          "dvorak.gkb" = pkgs.runCommand "grub-layout" {} ''
            # grub-kbdcomp does not work as it depends on ckbcomp being in $PATH
            "${pkgs.ckbcomp}/bin/ckbcomp" dvorak | "${pkgs.grub2}/bin/grub-mklayout" -o "$out"
          '';
        };
        extraConfig = ''
          terminal_input at_keyboard
          insmod keylayouts
          keymap /boot/dvorak.gkb
        '';
    };
  };