This is a programming forum, not a job marketplace
The description of the group is "The official mailing list for the
Ruby on Rails project. Where Rails users come to seek help, announce
projects, and discuss all kind of matters surrounding the framework
and the community." I don't think that precludes job related
information, within reason.
In fact what I find more annoying is when someone posts a question and
then re-posts the same question a few hours later, or posts a further
question which implies that they have solved the problem but have not
posted a follow-up to the original indicating the solution.