k8s-aarch6-n1: Add new Kubernetes node

This node provides an ARM64 build environment.

k8s-aarch64-n1.yaml

@@ -0,0 +1,14 @@
+variant: fcos
+version: 1.4.0
+ignition:
+  config:
+    merge:
+    - local: common.ign
+    - local: kubelet.ign
+
+storage:
+  files:
+  - path: /etc/hostname
+    contents:
+      inline: k8s-aarch64-n1.pyrocufflink.blue
+    mode: 0644