feat(lambda): parameterize Lambda runtime

Make Lambda runtime configurable by replacing hardcoded "python3.10" with a variable.
This allows users to specify different Python versions or other runtimes as needed,
while maintaining backward compatibility through the default value of "python3.10"

Author: diodonfrost

main.tf

@@ -264,7 +264,7 @@ resource "aws_lambda_function" "this" {
   function_name    = var.name
   role             = var.custom_iam_role_arn == null ? aws_iam_role.this[0].arn : var.custom_iam_role_arn
   handler          = "scheduler.main.lambda_handler"
-  runtime          = "python3.10"
+  runtime          = var.runtime
   timeout          = "600"
   kms_key_arn      = var.kms_key_arn == null ? "" : var.kms_key_arn
 

variables.tf

@@ -32,6 +32,12 @@ variable "aws_regions" {
   default     = null
 }
 
+variable "runtime" {
+  description = "The runtime environment for the Lambda function that you are uploading. For example, python3.8"
+  type        = string
+  default     = "python3.10"
+}
+
 variable "schedule_action" {
   description = "Define schedule action to apply on resources, accepted value are 'stop or 'start"
   type        = string