Expected Behavior

Able to build Dune 3.5.0-alpha1 on macOS + Nixpkgs

Actual Behavior

dune> File "_unknown_", line 1, characters 0-0:
dune> Error: Program codesign not found in the tree or in PATH
dune> Hint: codesign should be part of the macOS installation

I tried adding darwin.sigtool but I believe it brings up a password prompt that nix doesn't like.

Reproduction

• PR with a reproducing test:

Specifications

• Version of dune (output of dune --version):
• Version of ocaml (output of ocamlc --version)
• Operating system (distribution and version):

Additional information

• Link to gist with verbose output (run dune with the --verbose flag):