feat: added input variable for postgres version

Author: rahul-infra

examples/complete/main.tf

@@ -28,4 +28,6 @@ module "kong" {
   memory_for_kong_task           = var.memory_for_kong_task
   desired_count_for_kong_service = var.desired_count_for_kong_service
   force_new_deployment           = var.force_new_deployment
+  postgres_engine_version        = var.postgres_engine_version
+  postgres_major_engine_version  = var.postgres_major_engine_version
 }

examples/complete/variables.tf

@@ -122,3 +122,13 @@ variable "force_new_deployment" {
   description = "Whether to force new deployment"
   type        = bool
 }
+
+variable "postgres_engine_version" {
+  description = "The version of the Postgres engine"
+  type        = number
+}
+
+variable "postgres_major_engine_version" {
+  description = "The major version of the Postgres engine"
+  type        = number
+}

locals.tf

@@ -14,15 +14,16 @@ locals {
     engine               = "postgres"
     storage_encrypted    = true
     storage_type         = "gp3"
-    engine_version       = 16.3
-    engine_family        = "postgres16"
-    major_engine_version = 16
-    port                 = 5432
-    sg_name              = "kong-postgres"
-    sg_description       = "Allow all traffic within vpc"
-    postgres_username    = data.aws_ssm_parameter.rds["POSTGRES_USERNAME"].value
-    postgres_password    = data.aws_ssm_parameter.rds["POSTGRES_PASSWORD"].value
-    postgres_db_name     = data.aws_ssm_parameter.rds["POSTGRES_DB_NAME"].value
+    engine_version       = var.postgres_engine_version
+    engine_family        = "postgres${var.postgres_major_engine_version}"
+    major_engine_version = var.postgres_major_engine_version
+
+    port              = 5432
+    sg_name           = "kong-postgres"
+    sg_description    = "Allow all traffic within vpc"
+    postgres_username = data.aws_ssm_parameter.rds["POSTGRES_USERNAME"].value
+    postgres_password = data.aws_ssm_parameter.rds["POSTGRES_PASSWORD"].value
+    postgres_db_name  = data.aws_ssm_parameter.rds["POSTGRES_DB_NAME"].value
   }
 
   ecs = {

variables.tf

@@ -161,3 +161,23 @@ variable "force_new_deployment" {
   type        = bool
   default     = true
 }
+
+variable "postgres_engine_version" {
+  description = "PostgreSQL engine version for the RDS instance (e.g., 15.4, 16.3). Defaults to latest supported."
+  type        = number
+  default     = 16.3
+  validation {
+    condition     = var.postgres_engine_version >= 16
+    error_message = "The PostgreSQL engine version must be 16 or higher."
+  }
+}
+
+variable "postgres_major_engine_version" {
+  description = "Major PostgreSQL engine version (e.g., 15, 16). Used for parameter group family naming."
+  type        = number
+  default     = 16
+  validation {
+    condition     = var.postgres_major_engine_version >= 16
+    error_message = "The major PostgreSQL engine version must be 16 or higher."
+  }
+}