Hi all! Is there anyone here that can help me (noob) out with an overlay ? Somehow requirements at work need a specific version of dotnet-sdk. Now I made  this simple overlay : ```  final: prev:
{
  dotnet-sdk_3 = prev.dotnet-sdk_3.overrideAttrs(oldAttrs: rec {
    version = "4.1.407";
  });
}
``` and in shell.nix:  ` let unstable = import <nixos-unstable> { overlays = [ (import ./dotnet-overlay.nix) ]; }; `