Gp3 support (#8)

* add iops/throughput volume settings

main.tf

@@ -208,6 +208,8 @@ resource "aws_instance" "instance" {
   root_block_device {
     delete_on_termination = true
     encrypted             = true
+    iops                  = var.volume_iops
+    throughput            = var.volume_throughput
     volume_size           = var.volume_size
     volume_type           = var.volume_type
   }

variables.tf

@@ -95,6 +95,12 @@ variable "userdata_script" {
   default     = null
 }
 
+variable "volume_iops" {
+  default     = null
+  description = "IOPS to allocate to the instance's base drive. Only applicable when volume_type is io1, io2 or gp3."
+  type        = number
+}
+
 variable "volume_size" {
   description = "Size of the attached volume for this instance."
   type        = number
@@ -105,6 +111,12 @@ variable "volume_type" {
   type        = string
 }
 
+variable "volume_throughput" {
+  default     = null
+  description = "Value in MiB/s for throughput on instance volume. Only applicable when volume_type is gp3."
+  type        = number
+}
+
 variable "vpc" {
   description = "VPC ID to create the instance in."
   type        = string