[DockerHub] Adding the support for automated build in GitHub

[rouvoy]

1. Creating a Spirals-Team account on DockerHub
2. Using the automated build support for GitHub
3. Upload each benchmark container on DockerHub

[mcolmant]

Not possible on long builds (on dockerhub, or travis). The timeouts on travis is smaller than dockerhub. https://docs.travis-ci.com/user/customizing-the-build/#Build-Timeouts