Condition causes an issue when `var.zone` is computed in the host Terraform code.```  │ Error: Invalid count argument  │   │   on .terraform/modules/pg/modules/postgresql/read_replica.tf line 26, in data "google_compute_zones" "available":  │   26:   count   = var.zone == null ? 1 : 0  │   │ The "count" value depends on resource attributes that cannot be determined  │ until apply, so Terraform cannot predict how many instances will be  │ created. To work around this, use the -target argument to first apply only  │ the resources that the count depends on.```