flake.nix

{

  inputs.nixpkgs-terraform-providers-bin.url = github:nix-community/nixpkgs-terraform-providers-bin;

  outputs = { nixpkgs-terraform-providers-bin, nixpkgs, ... }: {
    defaultPackage.x86_64-linux =
     let
       pkgs = import nixpkgs { system = "x86_64-linux"; };
       providers = 
         nixpkgs-terraform-providers-bin.legacyPackages."x86_64-linux".providers;
     in (pkgs.terraform.withPlugins (_: [
           providers.kreuzwerker.docker
         ]));
  };
}

gistfile1.txt

$ /nix/store/74hpmw6jpbd077w21gvbjg0cpmqrf4nq-nix-2.12.0pre20221125_515b908/bin/nix build
warning: Git tree '/home/domen/dev/c9e7f40bcd007ec268cbd3e94ffb9711' is dirty
error: value is null while a set was expected

       at /home/domen/dev/c9e7f40bcd007ec268cbd3e94ffb9711/flake.nix:12:12:

           11|      in (pkgs.terraform.withPlugins (_: [
           12|            providers.kreuzwerker.docker
             |            ^
           13|          ]));
(use '--show-trace' to show detailed location information)