I know there are community maintained container images. "They" don't have an official one though. In fact I run it in a container as well, but I configures it to talk to an external mongodb cluster.

I need it to be an external cluster with some redundancy, so that I can easily backup the database, fix file corruption, and deal with other database errors.

Yeah, sounds like your deployment is probably a lot larger/more serious than my 2 AP at home deployment then ;)