PR's in this repo almost always fail multiple times due to the various balena push steps failing
the failures are due to connectivity issues during the build, most often the cloning of sd-mux-ctrl from tizens git repository
I changed the dockerfile to clone from a github mirror which is more consistent, and also removed testbot-personal from the push targets as its unused, and is another chance for a failure we don't really need
balena push
steps failingsd-mux-ctrl
from tizens git repository