gh_actions: if draft is enabled also install draft packages

[sphaero]

trafficstars

See: https://github.com/zeromq/zproject/blob/7fdba3a6d658e96d525ff28661aff7b82bfac620/zproject_gh_actions.gsl#L205-L212

It always installs from stable but for draft you might need draft support from other libs as well