docker run script: Overwriting current image prompt

[francocipollone]

When exiting the container there is a prompt asking whether to save the current changes:

Context

franco@47283edfdebd:~/maliput_ws$ exit
exit
access control enabled, only authorized clients can connect
Do you want to overwrite the image called 'maliput_ws_ubuntu' with the current changes? [y/n]: n

https://github.com/ToyotaResearchInstitute/maliput_infrastructure/blob/20da492557f853cd72763b94681301870ca1ed27/docker/run.sh#L95-L108

Issue

For this to work correctly, you need to add a docker to the sudoers group. Link

However, this is recommended when following the Installation and Quickstart guide. Check here

Suggestions

A - Ensure correct functionality without having to add docker to the sudoers group.
B - Update documentation to recommend adding docker to the sudoers group.