Use EnsureTask for create static pod directory

docs/boot-sequence.md

@@ -50,6 +50,10 @@ On nodes:
 
 * kube-proxy (which configures iptables so that the k8s-network will work)
 
+It is possible to add custom static pods by using `fileAssets` in the
+cluster spec. This might be useful for any custom bootstraping that
+doesn't fit into `additionalUserData` or `hooks`.
+
 ## kubelet start
 
 Kubelet starts up, starts (and restarts) all the containers in /etc/kubernetes/manifests.

nodeup/pkg/model/kubelet.go

@@ -95,7 +95,7 @@ func (b *KubeletBuilder) Build(c *fi.ModelBuilderContext) error {
 			if err != nil {
 				return err
 			}
-			c.AddTask(t)
+			c.EnsureTask(t)
 		}
 	}
 	{