v2: pushing to Github Container Registry fails

When pushing to the Github Container Registry, I get the following error:

#24 ERROR: server message: insufficient_scope: authorization failed
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 > exporting to image:
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failed to solve: rpc error: code = Unknown desc = server message: insufficient_scope: authorization failed
##[error]The process '/usr/bin/docker' failed with exit code 1

The PAT has what I believe is the required scope: delete:packages, read:packages, repo, write:packages.

If the full workflow is useful, you can find it here: https://github.com/cicirello/alpine-plus-plus/blob/master/.github/workflows/docker-publish.yml

There are two jobs in the workflow, the first pushes to Docker Hub successfully. The second attempts to push to the Github Container Registry, and fails. The docker/login-action succeeds in logging in to the GitHub Container Registry.

[cicirello]

@crazy-max Awesome. Thanks. It was definitely due to my missing ghcr.io/ at start of tags. It works now. It might be useful for v2 to have an example workflow for GHCR, as well as an example workflow for pushing to both Docker Hub and GHCR (e.g., your alpine-s6 workflow was helpful in simplifying mine).

[crazy-max]

@cicirello

I have pushed to GHCR successfully on this repo with the following workflow (see https://github.com/users/crazy-max/packages/container/alpine-s6).

The PAT has what I believe is the required scope: delete:packages, read:packages, repo, write:packages.

I would have thought that your scopes were not enough but it looks good to me.

But looking at the build command generated by the action, it looks like you forgot to prepend your tags with ghcr.io/.