Ignore any duplicates being returned by the pricing API when rebuilding machine types

hack/machine_types/machine_types.go

@@ -153,6 +153,7 @@ func run() error {
 		}
 	}
 
+	seen := map[string]bool{}
 	for _, item := range prices {
 		for k, v := range item {
 			if k == "product" {
@@ -162,6 +163,11 @@ func run() error {
 					attributes[k] = v.(string)
 				}
 
+				if _, ok := seen[attributes["instanceType"]]; ok {
+					continue
+				}
+				seen[attributes["instanceType"]] = true
+
 				machine := awsup.AWSMachineTypeInfo{
 					Name:  attributes["instanceType"],
 					Cores: stringToInt(attributes["vcpu"]),