Deploy Owncast, the open source Twitch

[d3adb5]

Owncast is a free and open source service for livestreaming. Compared to raw ffmpeg streams over the network, it offloads the network output from the streamer to the server itself.

While current cluster users may not have a use for it right now, it's still an interesting service to have available, provided it is relatively difficult to exploit.

May benefit from #1 being implemented first.