Automtaically add ipv6 entries to nix flake

Author: Pandapip1

flake.nix

@@ -29,9 +29,10 @@
           };
           config = mkIf cfg.enable {
             networking.extraHosts =
-              builtins.readFile (
-                "${self}/" + (if alternatesList != [] then alternatesPath else "") + "hosts"
-              );
+              let
+                orig = builtins.readFile ("${self}/" + (if alternatesList != [] then alternatesPath else "") + "hosts");
+                ipv6 = builtins.replaceStrings [ "0.0.0.0" ] [ "::" ] orig;
+              in orig + "\n" + ipv6;
           };
         };