checkUrlProtocol = function checkUrlProtocol(url) {
    if (!url.match(/^https?:\/\//i)) {
        // new Error is allowed here, as we do not want config to depend on @tryghost/error
        // @TODO: revisit this decision when @tryghost/error is no longer dependent on all of ghost-ignition
        // eslint-disable-next-line ghost/ghost-custom/no-native-error
        throw new Error('URL in config must be provided with protocol, eg. "http://my-ghost-blog.com"');
    }
}
Check if the URL in config has a protocol and sanitise it if not including a warning that it should be changed