Add support for the engine variable

Author: joseflores314

main.tf

@@ -174,6 +174,7 @@ resource "aws_elasticache_replication_group" "default" {
   maintenance_window         = var.maintenance_window
   notification_topic_arn     = var.notification_topic_arn
   engine_version             = var.engine_version
+  engine                     = var.engine
   at_rest_encryption_enabled = var.at_rest_encryption_enabled
   transit_encryption_enabled = var.transit_encryption_enabled
   kms_key_id                 = var.at_rest_encryption_enabled ? var.kms_key_id : null

variables.tf

@@ -57,7 +57,13 @@ variable "parameter" {
 variable "engine_version" {
   type        = string
   default     = "4.0.10"
-  description = "Redis engine version"
+  description = "Redis/Valkey engine version"
+}
+
+variable "engine" {
+  type        = string
+  default     = "redis"
+  description = "Redis or Valkey as a version"
 }
 
 variable "at_rest_encryption_enabled" {