Increase AMI builder capacity

variables.tf

@@ -38,8 +38,8 @@ variable "flake_lock_rev" {
 
 variable "builder_instance_type" {
   type        = string
-  default     = "t4g.large"
-  description = "Temporary EC2 instance type used to build and seed the AMI."
+  default     = null
+  description = "Temporary EC2 instance type used to build and seed the AMI. Defaults to c7g.2xlarge for aarch64-linux and c7i.2xlarge for x86_64-linux."
 }
 
 variable "vpc_id" {
@@ -78,12 +78,36 @@ variable "root_volume_size_gb" {
   description = "Temporary builder root EBS volume size. This becomes the final AMI root snapshot size."
 }
 
+variable "root_volume_iops" {
+  type        = number
+  default     = 6000
+  description = "Temporary builder root gp3 IOPS. This affects builder speed only; snapshots do not preserve provisioned IOPS."
+}
+
+variable "root_volume_throughput" {
+  type        = number
+  default     = 250
+  description = "Temporary builder root gp3 throughput in MiB/s. This affects builder speed only; snapshots do not preserve provisioned throughput."
+}
+
 variable "nix_volume_size_gb" {
   type        = number
   default     = 50
   description = "Temporary /nix EBS volume size. This becomes the final AMI /nix snapshot size."
 }
 
+variable "nix_volume_iops" {
+  type        = number
+  default     = 12000
+  description = "Temporary /nix gp3 IOPS used while building and seeding the AMI."
+}
+
+variable "nix_volume_throughput" {
+  type        = number
+  default     = 500
+  description = "Temporary /nix gp3 throughput in MiB/s used while building and seeding the AMI."
+}
+
 variable "nix_pool" {
   type        = string
   default     = "nixos-zfs-nix"