Delete a tag in ACR repository using CLI
If you have a tag in an ACR repository that you no longer need, you can delete it using the Azure CLI. It's a simple process and just requires remembering a few property names.
If you've not logged into Azure, do that first:
az login
Then, list the repositories in the registry to find the tag you want to delete:
az acr repository list --name acrname
Next list the tags for the repository you're interested in:
az acr repository show-tags --name acrname --repository your.repository
Once you've found the repository and tag you want to delete, you can delete it:
az acr repository delete --name acrname --image your.repository:1.2.3-alpha.456789
Obviously you'll need to replace acrname, your.repository and your.repository:1.2.3-alpha.456789 with your own values.