Consistent ordering of embedded files

[apognu]

Right now, as far as I can tell, and as reported in an issue in one of my projects, the ordering of the files in the built binary is undefined, since rust-embed uses WalkDir under the hood, which outputs files in undefined order unless the sort_by function is used.

Functionally, this doesn't matter, but it does pose issues for projects (and OSes and build processes) aiming or desiring reproducible builds.

As far as I can tell, this should be a pretty painless change, and backward compatible since the original order was always undefined.

I can try and craft a PR if it could help (and if this is wanted).

[AzureMarker]

Yeah that makes sense to me. Reproducible builds are good.

[apognu]

Do you want me to provide a PR?

[AzureMarker]

Yeah, that would be great

[apognu]

Done.

[pyrossh]

Released in v6.4.0