Building the collection artifact subpackage
    
    Description:
    If "--with collection_artifact" is added to rh/fedpkg build,
    rhel/linux-system-roles-collection-package is created.
    Notes:
    - have collection_artifact build always disabled by default
    - if building --with collection_artifact and without Ansible,
      fedpkg fails due to missing collection artifact (tarball).
    - copr build will specify --with collection_artifact explicitly.
    
    For %{without ansible}, ansible_collection_build generates tar at the
    collection top and ansible_collection_install untar from the tarball.