Deploy ns-auth BIND cluster

apps/base/ns-auth/cluster.yaml

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+---
+# Authoritative masters (replaces the 3x Puppet authoritative servers).
+# pod-0 is the primary; pods 1-2 replicate via the catalog zone + AXFR/IXFR.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindCluster
+metadata:
+  name: auth
+  namespace: ns-auth
+spec:
+  mode: authoritative
+  replicas: 3
+  storageClassName: cephrbd-fast-delete
+  storageSize: 2Gi
+  service:
+    type: LoadBalancer
+    annotations:
+      purelb.io/service-group: common
+      purelb.io/addresses: 198.18.200.6
+      external-dns.alpha.kubernetes.io/hostname: ns-auth.k8s.syd1.au.unkin.net
+  resources:
+    requests:
+      cpu: 100m
+      memory: 128Mi
+    limits:
+      cpu: "1"
+      memory: 512Mi
+---
+# Catalog zone so new BindZones auto-provision onto the secondaries.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindCatalogZone
+metadata:
+  name: auth-catalog
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: catalog.internal
+  transferKeyRef: transfer-key

apps/base/ns-auth/kustomization.yaml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - tsigkey.yaml
+  - cluster.yaml

apps/base/ns-auth/namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ns-auth

apps/base/ns-auth/tsigkey.yaml

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+---
+# Zone-transfer / catalog key. The operator generates the material into a
+# Secret (transfer-key-tsig); nothing sensitive is committed to git.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindTSIGKey
+metadata:
+  name: transfer-key
+  namespace: ns-auth
+spec:
+  algorithm: hmac-sha256

apps/overlays/au-syd1/ns-auth/kustomization.yaml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/ns-auth