To make unified relocatable package easily, we may want to merge tarballs to single tarball like this:
zcat .tar.gz | gzip -c > scylla-unified.tar.xz
But it's not possible with current relocatable package format, since there are multiple files conflicts, install.sh, SCYLLA--FILE, dist/, README.md, etc..
To support this, we need to archive everything in the directory when building relocatable package.
See: scylladb/scylla#6315
