buildx failed with: ERROR: failed to solve: failed to push docker.io/***/whoami-server:build-image-rev-0633ef58e460: failed to authorize: failed to fetch oauth token: unexpected status from GET request to https://auth.docker.io/token?scope=repository%3A***%2Fwhoami-server%3Apull%2Cpush&service=registry.docker.io: 401 Unauthorized

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/