We had an image promote failure for python-base:3.8. Due to docker
hub making it very difficult to know if old tags have been cleaned up we
are not sure that reenqueing the previous chagne to zuul will do the
right thing. It may downgrade the latest tag on some of our images. To
avoid any confusion over what is latest we just have zuul build new
images and promote them again.
Change-Id: Iaa859396030f1110b43788e73e9644a97e2ada9b
ecbe89f88f