So trying to build an iso with modifications based on https://docs.starlingx.io/developer_resources/build_guide.html#development-e... i seem to be running into an issue with this step cd $MY_REPO_ROOT_DIR/stx-tools/centos-mirror-tools && bash download_mirror.sh with a message This system is not registered with an entitlement server. You can use subscription-manager to register Do i really need a redhat registration to build an image ?