Main app.py has to return an exit code depending evaluation result

[angeleliseo]

If we want to get this as a tool that can be included in the CICD process it is a MUST to have a way to read from console if the final execution succeeded or failed.
As of now the output has to be validated by sight checking the string colored outputs, but to put it in an automation pipeline we need this to return a code that we can read and process for lets say GitHub actions or Jenkins so we can take the decision to fail or not the building process and possibly accept a merge or not.