Icecast server setup

An experiment to run an Icecast server that streams music in Opus (a more efficient audio format than MP3). Liquidsoap in one end reads a playlist and plays its songs, and on the other end it's connected to Icecast at a mountpoint. The user then connects to Icecast and recieves an Opus stream. To make this setup easy to install and replicate it's done in a Docker container.