emmc-image: copy config to /etc/nixos

emmc-image.nix

@@ -1,4 +1,4 @@
-{ config, lib,  pkgs, ... }:
+{ config, lib, pkgs, ... }:
 {
   imports = [
     <nixpkgs/nixos/modules/installer/cd-dvd/sd-image.nix>
@@ -9,6 +9,8 @@
   sdImage.populateRootCommands = ''
     mkdir -p ./files/boot
     ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
+    mkdir -p files/etc/nixos
+    cp -r ${pkgs.nix-gitignore.gitignoreSource [] ./.}/* ./files/etc/nixos/
   '';
   system.build.sdImage = with lib;
     let