[main] Update common Docker engineering infrastructure with latest#977

lbussell merged 2 commits intodotnet:maindotnet/dotnet-buildtools-prereqs-docker:mainfrom

dotnet-docker-bot:dotnet-buildtools-prereqs-docker-main-update-eng-commondotnet-docker-bot/dotnet-buildtools-prereqs-docker:dotnet-buildtools-prereqs-docker-main-update-eng-commonCopy head branch name to clipboard