Running a Command When a Docker Container Starts


I want to run a command when a docker container starts. I am creating a mirth software container and I want to run " /pathto-mirth-folder/mcserver start" command. How can I achieve this while creating a docker file?

I want to know another thing. Can cron jobs be run inside a docker container? I tried @reboot option in a container to run the above command when the docker container stops and start again, but it seems that it is not working( I have committed the container as well).