Bugfix/windows ci broken

The windows ci was broken for quite a while since we decided to refactor the gitlab yaml scripts for avoiding the gitlab stages. The problem was due to:

  script:
    - .\\build_server\\windows\\run_build.bat
    - .\\build_server\\windows\\run_tests.bat

which, once the first script finished, was closing the shell in which it was run, stopping there the ci process. To solve we had to modify slightly gitlab the yaml script with:

  script:
    - cmd /k .\\build_server\\windows\\run_build.bat
    - cmd /k .\\build_server\\windows\\run_tests.bat
    - cmd /k .\\build_server\\windows\\run_deploy.bat