AWS: Add CPU pricing mode and controller/worker disk variables

* Add `controller_disk_type`, `controller_disk_size`, and `controller_disk_iops`
variables
* Add `worker_disk_type`, `worker_disk_size`, and `worker_disk_iops` variables
and fix propagation to worker nodes
* Remove `disk_type`, `disk_size`, and `disk_iops` variables
* Add `controller_cpu_credits` and `worker_cpu_credits` variables to set CPU
pricing mode for burstable instance types

aws/flatcar-linux/kubernetes/workers/variables.tf

@@ -69,6 +69,12 @@ variable "spot_price" {
   default     = 0
 }
 
+variable "cpu_credits" {
+  type        = string
+  description = "CPU burst credits mode (if applicable)"
+  default     = null
+}
+
 variable "target_groups" {
   type        = list(string)
   description = "Additional target group ARNs to which instances should be added"

aws/flatcar-linux/kubernetes/workers/workers.tf

@@ -94,6 +94,10 @@ resource "aws_launch_template" "worker" {
     }
   }
 
+  credit_specification {
+    cpu_credits = var.cpu_credits
+  }
+
   lifecycle {
     // Override the default destroy and replace update behavior
     create_before_destroy = true