Docker: Some source command isn't added to the bashrc when running install deps script

[francocipollone]

Context

tools/install_dependencies.sh script adds /opt/ros/$ROS_DISTRO/setup.bash to the bashrc file.

https://github.com/ToyotaResearchInstitute/maliput_infrastructure/blob/8592f325085dcf45cc477aa26671d393a05884f1/tools/install_dependencies.sh#L101-L107

This script is recommended to be executed as sudo given some updates and install commands.

Issue

This is working correctly when this script is executed in bionic however when using focal, the source line is being added to the /root/.bashrc instead to the /home/USER/.basrhc, which a priori makes sense given that the script is being executed as sudo. (But in bionic it was working correctly).

Note: Same thing with the lines that do export ROS_DISTRO=.....

Possible solution

Execute the script sudoless and add the sudo commands that are necessary within the script.
This change should impact also on the maliput documentation - Installation and Quickstart page.