Documentation for Docker: possible ENV params

It would be great, if someone who knows the ENV params that could be used in with the docker image, would document them somewhere.

I am personally looking specifically for the `one db per user` and `single_node` setting to enable (on container creation).

The only documented params on the docker page (hidden within the texts, no table) are
- COUCHDB_USER
- COUCHDB_PASSWORD
- COUCHDB_SECRET
- NODENAME
- ERL_FLAGS (... https://www.erlang.org/doc/man/erl.html#environment-variables)

refering to: https://hub.docker.com/_/couchdb