modules/common/cache.nix

{
  nix.settings = {
    substituters = [ "https://cache.garnix.io" ];
    trusted-public-keys =
      [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
  };
}