Toy nix shell for ctfs
Since i included the burpsuite in this nix-shell, you either have to execute nix develop --impure if you're using flakes.
If you're not using flakes, you either can add the environment variable: NIXPKGS_ALLOW_UNFREE=1 or add { allowUnfree = true; } to your ~/.config/nixpkgs/config.nix.