Mqtt server under synology

hi everyone
I am new in open hab
I have installed openhab in an docker container in my synology nas
I would install also a server MQTT for generate a MQTT bridge bindign
I have reed that I can add mosquito as additional package in open hab but How can I do in a docker container?
I have tried to install another container with a mosquitto server but openhab in unable to connect to this containers
Anyone can help me

Installing MQTT-docker is really simple with the information of the docker image (Docker Hub), but if it didn’t work out with that, just use Marius’ excellent installation scripts, cleverly using the Taskmanager:

you can also edit the mosquitto.conf to your needs, if you need some changes to the standard-installation