[DPC-5063] add safeguards to avoid using dev docker images in sandbox/prod#2861

lukey-luke wants to merge 3 commits intomainCMSgov/dpc-app:mainfrom

ls/task-dpc-5063-ecr-imagesCMSgov/dpc-app:ls/task-dpc-5063-ecr-imagesCopy head branch name to clipboard