storage_form = async (req) => {
  return await config_fields_form({
    req,
    field_names: [
      "storage_s3_enabled",
      "storage_s3_bucket",
      "storage_s3_path_prefix",
      "storage_s3_endpoint",
      "storage_s3_region",
      "storage_s3_access_key",
      "storage_s3_access_secret",
      "storage_s3_secure",
    ],
    action: "/files/storage",
  });
}
S3 Storage settings form definition
@param {object} req request
@returns {Promise<Form>} form