feature request: support for redis sentinel

[wiese]

Thank you for providing this docker image. We like bull-board and the docker image is very convenient for us.

We run redis with sentinel. Currently we get away with pointing bull board to connect to one of the redis instances but this is brittle and unintuitive.

As bull-board uses ioredis under the hood, which supports sentinel, is it at all thinkable to extend the config of bull-board-docker to also support configuring sentinel instead of a single host?

What are your thoughts? Would you be open for a pull request?