release

config-brancher --config-dir ./ci-operator/config --current-release 4.20 --skip-periodics --future-release 4.21 --confirm

registry-replacer --github-token-path /etc/github/oauth --github-endpoint http://ghproxy --config-dir ./ci-operator/config --registry ./ci-operator/step-registry --prune-unused-replacements --prune-ocp-builder-replacements --prune-unused-base-images --current-release-minor=20 --ensure-correct-promotion-dockerfile-ignored-repos openshift/origin-aggregated-logging --ensure-correct-promotion-dockerfile-ignored-repos openshift/console --ensure-correct-promotion-dockerfile-ignored-repos openshift/linuxptp-daemon

Add maistra 3.1 builder image (#65636)