let nixpkgs-updater use the nix-community cache

build01/nixpkgs-update-disable-post-build-hook.patch

@@ -1,16 +0,0 @@
-diff --git a/src/Utils.hs b/src/Utils.hs
-index 00e539e..461b234 100644
---- a/src/Utils.hs
-+++ b/src/Utils.hs
-@@ -252,7 +252,10 @@ nixBuildOptions =
-     "true",
-     "--option",
-     "restrict-eval",
--    "true"
-+    "true",
-+    "--option",
-+    "post-build-hook",
-+    "/run/current-system/sw/bin/true"
-   ]
-     <> nixCommonOptions
- 

build01/nixpkgs-update.nix

@@ -4,11 +4,7 @@ let
   userLib = import ../users/lib.nix { inherit lib; };
 
   sources = import ../nix/sources.nix;
-  nixpkgs-update = (import sources.nixpkgs-update {}).overrideAttrs(old: {
-    patches = old.patches or [] ++ [
-      ./nixpkgs-update-disable-post-build-hook.patch
-    ];
-  });
+  nixpkgs-update = import sources.nixpkgs-update { };
 
   nixpkgs-update-bin = "${nixpkgs-update}/bin/nixpkgs-update";