[RFE] calm needs to know about ZStandard compressed archives

[Achim Gratz]

Brian Inglis writes:
> To which part does "No" apply: you specified -J which is --xz; you
> could instead specify -a, --auto-compress to use the archive suffix.

Here's the actual content of my test installation that I've used for the
Perl repository:

--8<---------------cut here---------------start------------->8---
CYGPORT_TAR_CMD="env ZSTD_CLEVEL=19 tar --group nobody:65534 --owner nobody:65534 -a"
CYGPORT_TAR_EXT=".tar.zst"
--8<---------------cut here---------------end--------------->8---


Regards,
Achim.
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