variables:
  imageNames.imageBuilder.linux: mcr.microsoft.com/dotnet-buildtools/image-builder:debian-20190917151244
  imageNames.imageBuilder.windows: mcr.microsoft.com/dotnet-buildtools/image-builder:nanoserver-20190917151244
  imageNames.imageBuilder.withrepo: imagebuilder-withrepo:$(Build.BuildId)-$(System.JobId)
  imageNames.testRunner: mcr.microsoft.com/dotnet-buildtools/prereqs:debian-stretch-slim-docker-testrunner-d61254f-20190807161111
  imageNames.testRunner.withrepo: testrunner-withrepo:$(Build.BuildId)-$(System.JobId)

variables:
  imageNames.imageBuilder.linux: mcr.microsoft.com/dotnet-buildtools/image-builder:debian-20190925142118
  imageNames.imageBuilder.windows: mcr.microsoft.com/dotnet-buildtools/image-builder:nanoserver-20190925142118
  imageNames.imageBuilder.withrepo: imagebuilder-withrepo:$(Build.BuildId)-$(System.JobId)
  imageNames.testRunner: mcr.microsoft.com/dotnet-buildtools/prereqs:debian-stretch-slim-docker-testrunner-d61254f-20190807161111
  imageNames.testRunner.withrepo: testrunner-withrepo:$(Build.BuildId)-$(System.JobId)

Update common Docker engineering infrastructure with latest
Update common Docker engineering infrastructure with latest