It looks like the first time you use the GitHub Package Registry it creates a "docker-base-layer" tag which is missing a manifest. Unfortunately one of the tools I'm using, fluxcd, queries the registry for new tags but throws the error:
manifest for tag docker-base-layer missing in repository
I also get error doing a docker pull:
manifest for docker.pkg.github.com/...:docker-base-layer not found: manifest unknown: Docker image reference docker-base-layer not found under repo
I'm not sure if this is going to cause problems down the road.
Thank for reporting this issue.
I tried docker pull docker.pkg.github.com/org/dockertest/docker-image:docker-base-layer. I got the same error as yours.
I am trying to contact package registry experts for your issue. When they give me any response, I will let you know at the first time.
I got response from Github Package Registry team, they said that docker-base-layer is kind of a meta tag that we use. it's not meant to be pulled directly.
They are working on hide it in the page UI and make docker image with tag docker-base-layer inaccessible.