docker --build-arg tags failing push to ACR

[jontreynes]

For some reason I'm getting the same issue as:

Azure/azure-cli#8305

when building with the docker file with tags. I simply take out the build tags and it's able to build and push.

This is at step
https://github.com/Azure/blackbelt-aks-hackfest/blob/master/labs/day1-labs/02-dockerize-apps(alt-acr-build).md
When running:
az acr build --registry $ACR_NAME --build-arg BUILD_DATE=date -u +"%Y-%m-%dT%H:%M:%SZ" --build-arg VCS_REF=git rev-parse --short HEAD --build-arg IMAGE_TAG_REF=v1 --image azureworkshop/rating-web:v1 .