Allow Google accelerators (i.e. GPUs) on workers

google-cloud/container-linux/kubernetes/workers/workers.tf

@@ -63,9 +63,13 @@ resource "google_compute_instance_template" "worker" {
   }
 
   can_ip_forward = true
-
   tags = ["worker", "${var.cluster_name}-worker", "${var.name}-worker"]
 
+  guest_accelerator {
+    count = "${var.accelerator_count}"
+    type = "${var.accelerator_type}"
+  }
+
   lifecycle {
     # To update an Instance Template, Terraform should replace the existing resource
     create_before_destroy = true