Execute bash command after image startup

[Anthony Joyce]

Hi all,

I want to execute a bash command inside a container after it has already 
started up. For example, I would like to execute an ssh command that forwards a 
port from the host to the container. I would like to automate this using the 
docker-compose.yaml if I can. I am using the official apache-airflow container 
image. How would I go about doing this? 

Thanks!

Anthony