Switch from docker buildx CLI to docker/build-push-action@v5 with oci-mediatypes=true to push OCI-format manifests that Zot accepts. Also type-check all three Python files in CI.
Switch from docker buildx CLI to docker/build-push-action@v5 with oci-mediatypes=true to push OCI-format manifests that Zot accepts. Also type-check all three Python files in CI.