dpkg-sig does not support the zst compression type while the dpkg-deb supports it

[Zoltan Fried]

Hello,

In the Ubuntu 22.04 dpkg-deb package uses the default compression type as the zstd.
The dpkg-sig can sign a ztsd used debian package surprisingly, while the dpkg-sig does not support it.

Please check the relevant part of the code:
<code>
        return "FORCE_BAD" unless ($seen_files{'debian-binary'} &&
            ($seen_files{'control.tar'} || $seen_files{'control.tar.gz'} || $seen_files{'control.tar.xz'}) &&
            ($seen_files{'data.tar'} || $seen_files{'data.tar.gz'} || $seen_files{'data.tar.xz'} || $seen_files{'data.tar.bz2'} || $seen_files{'data.tar.lzma'}));
<code>

Changing the compression type to xz using the dpkg-deb, the signature will be correct.

# lsb_release -rd
Description: Ubuntu 22.04.3 LTS
Release: 22.04

package: dpkg-sig 0.13.1+nmu4