?
Just as a quick update, this was added to our roadmap as an item we will be including. It'll be implemented likely using the same mechanisms as the Repository Monitors, so it gives a lot more flexibility with regards to what it can do (create builds, create releases, etc), and also uses cron-syntax for scheduling so you have even more flexibility.
No ETA, but I've added this post to the project plan so that we will upate it once it gets started.