[FR] Display container logs when "Container did not respond in time"

[shrektan]

"Container did not respond in time" is due to the docker container fails to launch shiny apps. However, the log of the docker is not included in the error message. Moreover, after the failure, the container is removed automatically.

Although we can launch a container by ourselves and see what happens really there, a better way I think is to attach the container log (a.k.a the log returned from docker log $container-name) in the error page by default.

Thanks.