initial AWS terraform (#180)

* initial AWS terraform

terraform/aws/modules/instance_group/variables.tf

@@ -0,0 +1,49 @@
+variable "name" {
+  type        = string
+  description = "Base name of the instance group."
+}
+
+variable "role" {
+  type        = string
+  description = "The role of the instance group. Has to be 'ControlPlane' or 'Worker'."
+}
+
+variable "uid" {
+  type        = string
+  description = "UID of the cluster. This is used for tags."
+}
+
+variable "instance_type" {
+  type        = string
+  description = "Instance type for the nodes."
+}
+
+variable "instance_count" {
+  type        = number
+  description = "Number of instances in the instance group."
+}
+
+variable "image_id" {
+  type        = string
+  description = "Image ID for the nodes."
+}
+
+variable "disk_size" {
+  type        = number
+  description = "Disk size for the nodes, in GB."
+}
+
+variable "target_group_arns" {
+  type        = list(string)
+  description = "ARN of the target group."
+}
+
+variable "subnetwork" {
+  type        = string
+  description = "Name of the subnetwork to use."
+}
+
+variable "iam_instance_profile" {
+  type        = string
+  description = "IAM instance profile for the nodes."
+}