Playing with OpenWhisk on IBM's Cloud and I'm really in shock that they seem to only be able to download Docker images from Docker Hub.
It has apparently been this way for a couple of years: https://developer.ibm.com/answers/questions/307961/does-bluemix-openwhisk-support-a-docker-action-pul.html
And what blows my mind is IBM even has its own container registry that apparently you can't use either.