No test of the Docker image we are building

[franck-boullier]

The problem:

In 3cfd038 (current version of the master) we have no test in place to make sure that the version of the Docker image that we are using is compatible with the code that is supposed to run on this image.

More information:

• The AWS codebuild script that generates the Docker image that will be used for deployment has no test step.
• See also issue Docker build has to be specific to each environment - Unecessary complexity #895