This is mostly a note to self and i no credit whatsoever to myself. Info collected mainly from this SO question, but i had some issues with the info there, mainly stuff caused by changes to Azure CLI and some code formatting issues.

https://stackoverflow.com/questions/41446962/how-to-delete-image-from-azure-container-registry

1. Login with Azure CLI, az login
2. Pick the correct subscription, az account set -s your_id
3. Then run this command.

az acr repository show-tags -n YourRegistry --repository YourRepository | ConvertFrom-String | %{$_.P2 -replace "[`",]",""} | where {$_ -notin "4698a2ae296ed953890c1d61bfaf370deedfb29f" } | %{az acr repository delete -n YourRegistry --image YourRepository:$_ --yes}