fix: improve publish workflow disk usage and split into

  separate jobs

  Use _cleanup() hook instead of overriding library cleanup() in
  download-artifacts.sh, and delete compressed artifacts after extraction
  to reduce peak disk usage during downloads.

  Split the single publish job into publish_debs and publish_rpms so each
  runs on its own runner downloading only its format's packages. Extract
  restart_web_server into its own job that depends on both.

Author: abtreece