* To reduce the image dimension, two RUN commands are merged in one single layer.
* All packages are installed with a single command.
* remove cern and garr mirrors
* the clean commands are the last instructions in the layer
* sudo is installed only in the dockerfile

As written in the best practise: https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#add-or-copy

To create the vscode user, the provide_user.sh script is used. With this script the comand line appearance is improved with colors and branch informations

Update the license format in Dockerfile as an example. These two lines need to be inserted in all the file in the project repo

Only one user is useful: test user and storm user have been removed. The default user has changed name in vscode because is the not-root user commonly used in devcontainer

The script can be used both for the devcontainer and for the continuous
integration.