feat(kube-system): Deploy PodDisruptionBudget for etcd

infrastructure/coredns/poddisruptionbudget.yaml → infrastructure/kube-system/poddisruptionbudget.yaml

@@ -8,3 +8,16 @@ spec:
   selector:
     matchLabels:
       k8s-app: kube-dns
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: etcd
+  namespace: kube-system
+spec:
+  maxUnavailable: 1
+  selector:
+    matchLabels:
+      component: etcd
+      tier: control-plane
+