Okay, looks like dracut *mostly* constructs the initramfs correctly. In
particular, the modules being left out look reasonable, and the final
file count is roughly similar to a couple of other Pis I have running
resolute (they're all ~3000 files):

dracut[D]: Mode:                     real
dracut[D]: Method:                   sha256
dracut[D]: Files:                    2977
dracut[D]: Linked:                   29 files
dracut[D]: Compared:                 0 xattrs
dracut[D]: Compared:                 324 files
dracut[D]: Saved:                    171.5 MiB
dracut[D]: Duration:                 8.628454 seconds

However, the compression step appears to be failing. The default
compression is zstd, so let's check that's operational with something
utterly trivial:

echo foo | zstd > foo.zst
unzstd < foo.zst

That should test zstd can compress and decompress (actually the decomp
doesn't matter as that's the kernel's job at boot time, but just to
check the zstd call compressed something correctly).

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https://bugs.launchpad.net/bugs/2155094

Title:
  RPi 3B, Zero 2W, 4B: New boot assets in /boot/firmware/new failed

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