buildx failed with: ERROR: failed to solve: unit:php8.4: failed to resolve source metadata for docker.io/library/unit:php8.4: docker.io/library/unit:php8.4: not found

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/