Fedora 36 is under development:

    $ podman run -it registry.fedoraproject.org/fedora:rawhide /bin/cat /etc/os-release
    NAME="Fedora Linux"
    VERSION="36 (Container Image Prerelease)"
    ID=fedora
    VERSION_ID=36
    VERSION_CODENAME=""
    PLATFORM_ID="platform:f36"
    PRETTY_NAME="Fedora Linux 36 (Container Image Prerelease)"
    ANSI_COLOR="0;38;2;60;110;180"
    LOGO=fedora-logo-icon
    CPE_NAME="cpe:/o:fedoraproject:fedora:36"
    HOME_URL="https://fedoraproject.org/"
    DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/"
    SUPPORT_URL="https://fedoraproject.org/wiki/Communicating_and_getting_help"
    BUG_REPORT_URL="https://bugzilla.redhat.com/"
    REDHAT_BUGZILLA_PRODUCT="Fedora"
    REDHAT_BUGZILLA_PRODUCT_VERSION=rawhide
    REDHAT_SUPPORT_PRODUCT="Fedora"
    REDHAT_SUPPORT_PRODUCT_VERSION=rawhide
    PRIVACY_POLICY_URL="https://fedoraproject.org/wiki/Legal:PrivacyPolicy"
    VARIANT="Container Image"
    VARIANT_ID=container

I couldn't get the changes runtime.json to show up until I built with a custom
target. I updated readme.md with that extra information too.