{
  nix.settings = {
    substituters = [
      "https://arm.cachix.org"
    ];
    trusted-public-keys = [
      "arm.cachix.org-1:K3XjAeWPgWkFtSS9ge5LJSLw3xgnNqyOaG7MDecmTQ8="
    ];
  };
}