Sonarr is so much better than Sickbeard, let's just leave it at that. To build this container manually use my build.sh script. If you need to test it, use my test.sh script. I've provided a systemd unit file for you to use if you're on a OS worth its salt. Cheers.
To run this container use
docker run --rm -v /home/media/downloads:/downloads:rw -v /home/software/docker/sonarr/:/config:rw -v /home/media:/media:rw -p 8989:8989 --name=sonarr nicholasvmoore/docker-sonarr