nixos: add genode.init.children.….configFile to system closure

nixos-modules/genode-core.nix

@@ -135,10 +135,16 @@ in {
     system.build.tarball =
       pkgs.callPackage "${modulesPath}/../lib/make-system-tarball.nix" {
         contents = [ ];
-        storeContents = mapAttrsToList (name: object: {
-          symlink = "rom/${name}";
-          inherit object;
-        }) romDirectories;
+        storeContents = let
+          romDirs = mapAttrsToList (name: object: {
+            symlink = "rom/${name}";
+            inherit object;
+          }) romDirectories;
+          configFiles = mapAttrsToList (name: child: {
+            symlink = "config/${name}.dhall";
+            object = child.configFile;
+          }) config.genode.init.children;
+        in romDirs ++ configFiles;
         compressCommand = "cat";
         compressionExtension = "";
       };