nixos/tinydns: order service after network.target

In cases where you boot up really quickly (like in the VM test on a
non-busy host), tinydns might want to bind before the loopback interface
is fully up. Order tinydns after network.target to fix that.

nixos/modules/services/networking/tinydns.nix

@@ -37,6 +37,7 @@ with lib;
     systemd.services.tinydns = {
       description = "djbdns tinydns server";
       wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
       path = with pkgs; [ daemontools djbdns ];
       preStart = ''
         rm -rf /var/lib/tinydns