buildx failed with: ERROR: failed to solve: failed to push ghcr.io/alfresco/example-process-application: failed to authorize: failed to fetch anonymous token: unexpected status from GET request to https://ghcr.io/token?scope=repository%3Aalfresco%2Fexample-process-application%3Apull%2Cpush&service=ghcr.io: 403 Forbidden