Failed pushing to Github Container Registry

Question

I am using GitHub workflows to push a small package to a private GH container registry. Yesterday most of my workflows went through, but suddenly they stop working. I am not aware of any recent setting changes.

I am using {{ secrets.GITHUB_TOKEN}} with Workflow write permissions enabled.

enter image description here

I replaced my actual organization name with test-user for privacy reasons.

buildx failed with: ERROR: failed to solve: failed to push test-user/bar:1.8.2:
 failed to authorize: failed to fetch oauth token: unexpected status: 401 Unauthorized

This is an extract of my workflow file:

 - name: Login to Docker registry
 uses: docker/login-action@v2
 with:
 registry: ghcr.io
 username: ${{ github.repository_owner }}
 password: ${{ secrets.GITHUB_TOKEN }}
... 
 - name: Build and push
 uses: docker/build-push-action@v4
 with:
 context: .
 push: true
 tags: ${{ steps.meta.outputs.tags }}
 labels: ${{ steps.meta.outputs.labels }}

Any idea what could trigger the 401?

Answer 1

Make sure you are only pushing images with the ghcr.io/ prefix in the name. Otherwise, it will try to push to docker hub and fail if you haven't used the login action to login to docker hub.

• A.J.: here is the docs docs.docker.com/build/ci/github-actions/manage-tags-labels