Publish Docker Image to GitHub Container Registry?

Is it possible to push docker images to ghcr?  I have set up ghcr as a regular docker registry, and when I do the 'test connection' it says connection successful.  But when I attempt to do a docker push from my build configuration I get an authentication failure.

denied: unauthenticated: User cannot be authenticated with the token provided.
Process exited with code 1
Process exited with code 1 (Step: Publish (Docker))