dns: use better date for teh serial

applications/dns/dns.nix

@@ -3,13 +3,14 @@
   pkgs,
   config,
   nodes,
+  self,
   ...
 }: let
   name = "dns";
   cfg = config.services.skynet."${name}";
 
   # reads that date to a string (will need to be fixed in 2038)
-  current_date = builtins.currentTime;
+  current_date = self.lastModified;
 
   # this gets a list of all domains we have records for
   domains = lib.lists.naturalSort (

flake.nix

@@ -131,7 +131,7 @@
           overlays = [];
         };
         specialArgs = {
-          inherit inputs;
+          inherit inputs self;
         };
       };