Fix composefs and kdump interaction

As part of https://github.com/coreos/fedora-coreos-tracker/issues/1718 and #11 (comment 1929130136), we are looking at unify on composefs.

We are having a weird issue with kdump when composefs is enabled:

Is this tested with the bootc images?

Edited Jul 19, 2024 by Timothée Ravier

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