pkgs/den-http-get-updater: add extraPackages argument

useful for contentParser argument

pkgs/by-name/de/den-http-get-updater/package.nix

@@ -25,6 +25,9 @@
   #
   prefetchList ? [],
 
+  # extra packages to add to the path
+  extraPackages ? [],
+
   # change newVersion variable in it, if the contents of the page
   # is not plaintext version
   # (json for example)
@@ -63,12 +66,12 @@ let
   nixUnpack = lib.optionalString unpack "--unpack";
   nixName = lib.optionalString (!builtins.isNull name) "--name \"${lib.escapeShellArg name}\"";
 
-  path = lib.makeBinPath [
+  path = lib.makeBinPath ([
     curl
     gawk
     jq
     nix
-  ];
+  ] ++ extraPackages);
 in
 
 writeScript "den-http-get-updater" (''