formatting: add a way to override binaries

[emillon]

As described in #2315, once we have (formatting) we should have a way to override paths to formatting binaries. This might be a workspace option.

[bobot]

Is it not already possible thanks to (paths in dune-workspace #2426 ?

[emillon]

That's indeed a way to implement it, but I think that the original proposal included things like using a binary named ocamlformat-0.10, for example.

[nojb]

That's indeed a way to implement it, but I think that the original proposal included things like using a binary named ocamlformat-0.10, for example.

Have you tried with (env (_ (binaries ...))) ?

[rgrinberg]

We already have a mechanism for overriding binaries as Nicolas mentioned. It can be improved if it doesn't work for this use case.