We also remove the Makefile to go to a simpler build system, as long with
the retry_docker_push.sh file. We remove the rest of the automation tools
as they're no longer used and update the circle.yml file.
We also remove debug builds, as these aren't needed moving forward, and were
only to enable livepush builds.
Change-type: major
Signed-off-by: Cameron Diver <cameron@balena.io>
