2017-08-16 it's now dockerized.
I already had a version running locally so I reused its data and log folders. When I started it up it migrated my old database to the 5.5 version of UniFi. It was able to successfully detect my UniFi AP and updated its IP address to my new address scheme and then provisioned it. EXCELLENT.
docker run -d --restart=always -p 8080:8080 -p 8443:8443 -p 3478:3478 -p 10001:10001 -e TZ='Americas/Los_Angeles' \ -v /var/lib/unifi/data:/var/lib/unifi -v /var/log/unifi:/var/log/unifi --name=unifi jacobalberty/unifi
Watch the daemon.log on Bellman and you can watch devices try to associate with the WAP.