Can i run Terraform only once ?

[anpolychrono]

I have a problem where I want to create a user only if it doesn't exists. The provider has a data resource to check the existing users, so I can use it to decide when to create a user. But on the 2nd run of plan/apply the user will be deleted. How would you handle it ? I am thinking if there is an option to run the Terraform only once meaning disable reconcile, this way i will be sure that the new user is not delete on the 2nd run :

Code example:

data "gitlab_users" "user" {
  search = var.email
}

locals {
  user_exists = length(data.gitlab_users.user.users) == 1
}

resource "gitlab_user" "user" {
  # Only create if user doesn't exist
  count = local.user_exists ? 0 : 1

  name             = var.name
  username         = var.username
  email            = var.email
  is_admin         = false
  projects_limit   = 1
  can_create_group = false
  is_external      = true
  reset_password   = true

}