add derivation for go-wol

hosts/vega/default.nix

@@ -1,4 +1,4 @@
-{...}: {
+{pkgs, ...}: {
   imports = [
     ./hardware-configuration.nix
     ../common
@@ -44,6 +44,8 @@
     };
   };
 
+  environment.systemPackages = with pkgs; [go-wol];
+
   environment.persistence."/persist" = {
     enable = false;
   };