Expected Behavior

Using dune-site generates a Sites.ml file. I expect this file to not be signed during installation

Actual Behavior

Dune signs Sites.ml, e.g.

/nix/store/q9fdiivimqczivx790w1w723jrxs7kkj-ocaml5.1.0-rc1-camomile-1.0.2/lib/ocaml/5.1.0~rc1/site-lib/camomile/lib/.#Sites.ml.dune-temp

(as part of Artifact_substitution.copy_file)

cc @emillon