support equivalent to tar's --clamp-mtime#409
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Based on changes in composefs#409, composefs#424. Co-authored-by: Eashwar Ranganathan <eashwar@eashwar.com> Co-authored-by: Tom Fay <tom@teamfay.co.uk>
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I'm using this crate to build reproducible container images from os packages. I want uid/gid's preserved so I don't use
HeaderMode::Deterministic, so I manually do the equivalent of tar'sclamp-mtime: https://github.com/Metaswitch/rpmoci/blob/fd11658fa8d0085e9275ee000bf5eb58cf9f7e51/src/archive.rs#L100I can achieve this simpler if this crate supports a clamp-mtime header mode.
The enum's non-exhaustive so this isn't a breaking change.
(I also see #339 which is similar - instead of adding support for clamp mtime directly I could add a header mode that allows the caller to provide a function that can modify the header with the given file metadata)