dracut expects the environment, in which it is run, to have properly
mounted /proc, /dev and /sys. Otherwise, some of its modules don't work
properly. E.g. dracut fails to embed the CA cert bundle into the initram
disk, which means that HTTPS won't work in it. dracut also prints a lot
of errors and warnings about this, but we used to ignore them until now.
The buildroot environment in which the stage runs is OK, but we actually
run dracut using 'chroot', which is the core of the problem. The runtime
environment in such case lacks the necessary mounts.
Add a context manager for setting up and cleaning up all the necessary
mounts in the image FS tree when running dracut.
This change is related to:
https://bugzilla.redhat.com/show_bug.cgi?id=1962975
And the implementation has been inspired by the fix in lorax:
https://github.com/weldr/lorax/pull/1151
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
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