downtime_check
15fcd9650f (!18547) squashes old migrations to a single one. Old migrations had `rubocop:disable all` rule, but the new migration doesn't have it, so the `downtime_check` fails. This commit explicitly tells that the migration requires downtime.
15fcd9650f
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>