When using the Azure Credentials plugin, I can set up a specific Service Principal credential type which will expose an AZURE_CLIENT_ID and AZURE_CLIENT_SECRET into my Pipeline's environment, which can be used as the username/password for an Azure Container Registry.

Unfortunately, the docker.withRegistry() method only accepts a URI and Username/Password Credential type,

It would be nice to support an overload of withRegistry() which accepts: uri, username, password