PubSub example needs setup documentation, take 2

[ModalityZ]

The original discussion #412 (reply in thread) was closed before the marked answer was tested, and it turned out not to work (for me, the OP). I'm not a "collaborator" here, so I've created a new discussion as suggested at https://github.com/orgs/community/discussions/41926#discussioncomment-6981064

[jmklix]

Sorry for the delay, reopened the discussion you mentioned. Closing this one

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.