The source code for the build can be found at https://github.com/Unicamp-OpenPower/docker-ce-releases.
If you like OpenSUSE you can now try it for FREE at Unicamp’s Minicloud. The Minicloud is hosted by the University of Campinas – Unicamp, which is an academic member of the OpenPower Foundation. It provides free access to Power® virtual machines that can be used for development, testing or migration of applications to Power®. Enjoy!