The main script ci/images/test-build should be most up to date and
copied to all docker templates, sync them. Fix descriptions that were
copy&pasted from musl. Add missing test-build script from musl image.
Signed-off-by: David Sterba <dsterba@suse.com>
Add some scripts for convenience, so far there was only one for musl as
it usually breaks first, but we've had some problems on centos due to
old kernel headers and potential breakage when changing kerncpomat.h.
Signed-off-by: David Sterba <dsterba@suse.com>