$ docker run -e MQTTWARN_CABUNDLE=http://www.startssl.com/certs/ca-bundle.pem MQTTWARN_CONF=https://example.com/4erf shift/mqttwarn
$ docker run -e MQTTWARN_CABUNDLE=http://www.startssl.com/certs/ca-bundle.pem MQTTWARN_CONF=https://example.com/4erf shift/mqttwarn