rpmtree: support gzip compression #170
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Currently, users must rely on pkg_tar to compress the archive generated by rpmtree. However, the unpacking and repacking process in pkg_tar can introduce duplicate file entires, which causes failures in downstream consumers like rules_oci.
This PR adds a --compression flag to rpmtree, allowing it to output compressed archives (e.g., gzip) directly, bypassing the need for an intermediate pkg_tar step.