fix: TF dependency bugfix (#42)

main.tf

@@ -33,15 +33,11 @@ locals {
   deployment_filename = "costnotifier-${var.runtime}.zip"
   deployment_path     = "${path.module}/${local.deployment_filename}"
 
-  use_s3 = (
-    var.upload_deployment_to_s3 && var.s3_bucket != null
-  )
-
   s3_key = coalesce(var.s3_key, join("/", [var.naming_prefix, local.deployment_filename]))
 }
 
 resource "aws_s3_object" "deployment" {
-  count  = local.use_s3 && var.upload_deployment_to_s3 ? 1 : 0
+  count  = var.upload_deployment_to_s3 && (var.s3_bucket != null) ? 1 : 0
   bucket = var.s3_bucket
   key    = local.s3_key
   source = local.deployment_path
@@ -65,7 +61,7 @@ module "billing_notifier_lambda" {
   local_existing_package = local.deployment_path
 
   s3_existing_package = (
-    local.use_s3
+    var.s3_bucket != null
     ? {
       bucket = var.s3_bucket
       key    = local.s3_key