Add default values for vault-operator module vars (#522)

Author: ltellesfl

modules/common/vault-secrets-operator-setup/variables.tf

@@ -13,9 +13,17 @@ variable "lambda_sns_forwarder_enabled" {
   type    = bool
   default = false
 }
-variable "lambda_sns_forwarder_iam_principal_arn" {}
+variable "lambda_sns_forwarder_iam_principal_arn" {
+  type        = string
+  default     = ""
+  description = "IAM principal ARN for the lambda SNS forwarder"
+}
 
-variable "account_id" {}
+variable "account_id" {
+  type        = string
+  default     = ""
+  description = "AWS account ID"
+}
 
 locals {
   account_region_name = lower("${var.account}-${var.region}-${var.name}")