Extend build coverage. The versions are different on all images and can
be run as:
$ ./docker-run --env CC=clang
Signed-off-by: David Sterba <dsterba@suse.com>
The support for zoned mode is incomplete and won't change so we can
disable it on Leap 15.2 and Centos 8.
Signed-off-by: David Sterba <dsterba@suse.com>