[Bug 2035120] [NEW] cryptsetup autopkgtest fails with zstd compressed kernel modules

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[Impact]

cryptsetup is using a custom script to create an initramfs and include
kernel modules, however it is encoding *.ko and now that we have zstd
compressed modules in the kernel it fails to include the proper modules
in the initramfs (since the modules are now called *.ko.zst).

[Test case]

Run cryptsetup autopkgtest.

[Fix]

Workaround this issue by unpacking all modules in a temporary extract
directory, so that debian/tests/utils/mkinitramfs can support either
compressed and uncompressed modules.

[Regression potential]

This change fixes the autopkgtest test case, it doesn't touch cryptsetup
at all, so the only regressions that we can experience are in the
autopkgtest.

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: cryptsetup (Ubuntu Mantic)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
cryptsetup autopkgtest fails with zstd compressed kernel modules
https://bugs.launchpad.net/bugs/2035120
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