Here’s our official Spreed WebRTC systemd script:
Simply move it into the /etc/systemd/system/ directory and run systemctl enable spreed-webrtc.service
Make sure to update /usr/sbin/spreed-webrtc-server to the location of your Spreed WebRTC binary and also create a /etc/default/spreed-webrtc file based on this content: https://github.com/spreedbox-packaging/spreed-webrtc-debian/blob/ubuntu/trusty/debian/spreed-webrtc.default
(Again, make sure to update the paths wherever applicable.