Sorry for the delay in answering, I will strongly suggest you to use maven for creating projects that can be easily imported into the KIE Workbench. Take a look at the jbpm-playground and try to follow the same structure for your projects, then you can upload those projects to github and clone them inside the KIE-Workbench. As you mention you can also push the projects to the KIE Workbench internal repositories, but I will definitely recommend you to have your projects in github just to make sure that you have a safe backup there.
Does it make sense?
Thank you very much for your suggestion! I will have a try to change the structure of my project to maven.