ark/modules/cachix/nix-community.nix

{
  nix.settings = {
    substituters = ["https://nix-community.cachix.org"];
    trusted-public-keys = ["nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="];
  };
}