Automate releases to Opencast #230
Description
Ideally, changes made in the admin ui are reflected in new Opencast builds at least soonish. For that, we should set up consistent releases for each maintained Opencast branch (so the two currently maintained releases and develop). We could either do that by filing pull requests or pushing directly onto the branch. And ideally, we automate this since I really don't want to cut three branches every week.