bring back shell.nix

[savil]

Summary

We can bring back the shell.nix file to ensure older .envrc files work.

It was removed in #902.

How was it tested?

did devbox shell and saw that .devbox/gen/shell.nix exists.

❯ cat .devbox/gen/shell.nix
let
  pkgs = import
    (fetchTarball {
      url = "https://github.com/nixos/nixpkgs/archive/3364b5b117f65fe1ce65a3cdd5612a078a3b31e3.tar.gz";
    })
    { };
in
with pkgs;
mkShell {
  packages = [
      go_1_20
      golangci-lint
      actionlint
  ];
}

[savil]

Current dependencies on/for this PR:

• main
  • PR bring back shell.nix #927 👈

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