add prefix/suffix and disk size

variables.tf

@@ -62,3 +62,8 @@ variable "name_suffix" {
   description = "The suffix for all your resources, suggest generating a unique value for each deployment"
   type        = string
 }
+
+variable "disk_size" {
+  description = "Size of instance disk in Gigabytes"
+  default = 10
+}