should not "tar" to tar, otherwise we'd have following error: ``` tar (child): tar: Cannot open: No such file or directory tar (child): Error is not recoverable: exiting now tar: Child returned status 2 tar: Error is not recoverable: exiting now ``` as "tar" is not the compressed tarball we want to untar. Fixes #15328 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes #15383