[backport] ci: hardcode docker container build image into release/v1.4#3114

rbtr merged 1 commit intorelease/v1.4Azure/azure-container-networking:release/v1.4from

jpayne3506/bpv1.4-3102Azure/azure-container-networking:jpayne3506/bpv1.4-3102Copy head branch name to clipboard