The current image send a 301 - permanent moving to https wheh trying to connect with http but the SSL ask for SSLv3 which is no more available.
When used bahind a front like nginx / apache, SSL is useless.
This behavior should be de/activable using parameter (either docker command line or docker-compose env for example.
I tried to locate where to modify but didn't know ruby :(
I didn't found how to specify development instead of production by login into running container either