Add k8s external-dns zones from puppet-prod

Migrates the two zones the puppet external-dns instances serve
(externaldns::k8s_zones) as dynamic BindZone CRs on the externaldns
cluster, plus a catalog zone so they replicate to the secondaries.

- add apps/base/ns-externaldns/zones.yaml: k8s.syd1.au.unkin.net and
  200.18.198.in-addr.arpa (primary, dynamicUpdate via externaldns-key)
- add a BindCatalogZone so external-dns writes to the primary replicate

apps/base/ns-externaldns/cluster.yaml

@@ -0,0 +1,39 @@
+---
+# external-dns tier (replaces the 3x Puppet external-dns servers). An ordinary
+# authoritative cluster; external-dns writes to its zones via RFC2136 because
+# those BindZones set dynamicUpdate (allow-update { key externaldns-key; }).
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindCluster
+metadata:
+  name: externaldns
+  namespace: ns-externaldns
+spec:
+  mode: authoritative
+  replicas: 3
+  storageClassName: cephrbd-fast-delete
+  storageSize: 1Gi
+  service:
+    type: LoadBalancer
+    annotations:
+      purelb.io/service-group: common
+      purelb.io/addresses: 198.18.200.8
+      external-dns.alpha.kubernetes.io/hostname: ns-externaldns.k8s.syd1.au.unkin.net
+  resources:
+    requests:
+      cpu: 100m
+      memory: 128Mi
+    limits:
+      cpu: "1"
+      memory: 512Mi
+---
+# Catalog zone so the dynamic zones replicate onto the cluster's secondaries
+# (external-dns writes to the primary; secondaries IXFR the result).
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindCatalogZone
+metadata:
+  name: externaldns-catalog
+  namespace: ns-externaldns
+spec:
+  clusterRef: externaldns
+  zoneName: catalog.externaldns.internal
+  transferKeyRef: externaldns-key

apps/base/ns-externaldns/kustomization.yaml

@@ -0,0 +1,9 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - tsigkey.yaml
+  - cluster.yaml
+  - zones.yaml

apps/base/ns-externaldns/namespace.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ns-externaldns

apps/base/ns-externaldns/tsigkey.yaml

@@ -0,0 +1,10 @@
+---
+# Key that external-dns (and DNSRecord objects) use to send RFC2136 dynamic
+# updates to the primary. The operator generates the material into a Secret.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindTSIGKey
+metadata:
+  name: externaldns-key
+  namespace: ns-externaldns
+spec:
+  algorithm: hmac-sha256

apps/base/ns-externaldns/zones.yaml

@@ -0,0 +1,34 @@
+# k8s external-dns zones migrated from puppet-prod
+# (externaldns::k8s_zones in hieradata/roles/infra/dns/externaldns.yaml).
+# Primary + dynamicUpdate: the Kubernetes external-dns controller writes
+# records here via RFC2136 authenticated with externaldns-key.
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: k8s-syd1-au-unkin-net
+  namespace: ns-externaldns
+spec:
+  clusterRef: externaldns
+  zoneName: k8s.syd1.au.unkin.net
+  type: primary
+  defaultTTL: 600
+  dynamicUpdate: true
+  updateKeyRef: externaldns-key
+  allowTransfer:
+    - key externaldns-key
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 200-18-198-in-addr-arpa
+  namespace: ns-externaldns
+spec:
+  clusterRef: externaldns
+  zoneName: 200.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+  dynamicUpdate: true
+  updateKeyRef: externaldns-key
+  allowTransfer:
+    - key externaldns-key

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

@@ -0,0 +1,6 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/ns-externaldns