filter local zones (#13)

default cluster creation doesn't internally distinguish local zones

tf may try to create a nat gateway there or the control plane
both will result in a failed create status

cluster/terraform/main.tf

@@ -38,7 +38,12 @@ data "aws_ecrpublic_authorization_token" "token" {
   provider = aws.virginia
 }
 
-data "aws_availability_zones" "available" {}
+data "aws_availability_zones" "available" {
+  filter {
+    name   = "opt-in-status"
+    values = ["opt-in-not-required"]
+  }
+}
 
 locals {
   name            = "karpenter-blueprints"