This is a dockerized version of AirConnect (https://github.com/philippe44/AirConnect) which bridges AirPlay with Sonos and the Google Cast protocol. Rewritten for Raspberry Pi from https://github.com/swilsonau/docker-airconnect
Simply run:
docker build -t docker-airconnect-rpi .
docker run -d --net=host --name=airconnect --restart=unless-stopped docker-airconnect-rpi