Get a flake.nix together to be able to install dioxus-cli

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I had to compare a bunch of online examples and copy paste stuff here and there to get dioxus-cli to compile:

# flake.nix
{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = {
    self,
    nixpkgs,
    rust-overlay,
    flake-utils, ...
  }: flake-utils.lib.eachDefaultSystem (system:
    let
      overlays = [ (import rust-overlay)];
      pkgs = import nixpkgs {
        inherit system overlays;
      };
      toolchain = pkgs.rust-bin.fromRustupToolchainFile ./toolchain.toml;
    in
    {
      devShells.default = pkgs.mkShell {
        packages = [
          pkgs.darwin.apple_sdk.frameworks.Security
          pkgs.darwin.apple_sdk.frameworks.CoreServices
          pkgs.zlib
          toolchain
        ];
      };
    }
  );
}

Toolchain contains:

[toolchain]
channel = "nightly"
profile = "default"
targets = ["wasm32-unknown-unknown", "aarch64-apple-darwin"]

That was a relatively bad experience and it set back my development here back by at least 30-45 minutes.

Then I found out that the cli is in nixpkgs, so for that I needn’t have bothered (but might need the same dependencies for developing anyway?).