Downloads one or more packages together with their full dependency
closure (resolved against an empty rpm db so the result works on a
target machine with an arbitrary baseline, not just what's missing on
the machine running the script), then builds a local apt-rpm "classic"
repository via genbasedir --bloat (required: without --bloat, genbasedir
strips version data from some soname Provides, e.g. libssh2 -> mc, which
breaks dependency resolution on a truly clean target even though the
same packages resolve fine against the real upstream repo).
Verified end-to-end against a live ALT SP Server 10.2.2 test machine,
including simulating a from-scratch install using only the generated
repo (no upstream access).
