In reply to @gotha:matrix.org
hey, I am using direnv with flakes to install dev dependencies.
My issue is that some packages are not available for aarch64-darwin (helm for example), I know nix-darwin can install packages using homebrew.
Is there a way to install homebrew package via flake and direnv?

if I want a flake output of nixosConfigurations.hello-world but need it to exist for each system architecture, is there a trick to do that? Doing this:

let
    forEachSystem = nixpkgs.lib.genAttrs [ 
      "aarch64-darwin"
      "aarch64-linux"
      "x86_64-darwin"
      "x86_64-linux"
    ];
  in {    
nixosConfigurations = forEachSystem (system: {
          # include our module
          self.outputs.nixosModules.default
          ./examples/hello-world-configuration.nix
        ];
      };
};

almost gets me there but it makes me do nix build .#nixosConfigurations.x86_64-linux.hello-world but I want to get rid of that x86_64-linux part of the command and cannot figure out the trick to do so.