Run bird from a container

I am interested in running Bird from within a docker container to act as a BGP router. I see that https://hub.docker.com/r/calico/bird exists but when I deploy it it doesn’t seem to have anything inside of it. Maybe I am not using this calico bird container properly? If this is the wrong direction, I can just yum install a bird rpm into a ubi container and move forward that way. Any suggestions would be much appreciated. Thanks, Billy