add mailroom to list of indices
related to: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/9523
Signed-off-by: Michal Wasilewski mwasilewski@gitlab.com
related to: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/9523
Signed-off-by: Michal Wasilewski mwasilewski@gitlab.com