Deploy binddns-auth (authoritative BIND cluster) (#220)

Part of the bind rollout split. **Merge #219 (bind-operator) first** — this PR is stacked on it, so its diff will reduce to just the binddns-auth files once #219 merges.

## Why
The authoritative masters tier (replaces 3x Puppet authoritative servers): pod-0 primary + 2 secondaries replicating via the catalog zone + AXFR/IXFR.

## Changes
- `apps/base/binddns-auth`: authoritative `BindCluster` (3 replicas, LoadBalancer/PureLB), `BindCatalogZone`, transfer `BindTSIGKey`, namespace
- au-syd1 `binddns-auth` overlay

## Deploy impact
Creates the `binddns-auth` StatefulSet + LoadBalancer once merged.

Reviewed-on: #220
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/base/ns-auth/cluster.yaml

@@ -0,0 +1,37 @@
+---
+# 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

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

apps/base/ns-auth/namespace.yaml

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

apps/base/ns-auth/tsigkey.yaml

@@ -0,0 +1,10 @@
+---
+# 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/base/ns-auth/zones.yaml

@@ -0,0 +1,204 @@
+# Authoritative zones migrated from puppet-prod
+# (profiles::dns::master::zones in hieradata/roles/infra/dns/master.yaml).
+# type primary, static (puppet dynamic:false); TTL 600 as in the puppet zone header.
+# Record data is populated by PuppetDB exported resources upstream, so it is
+# NOT in this repo — migrate it into these zones (AXFR from the current masters,
+# or DNSRecord CRs) as a follow-up. The zones start with SOA+NS only.
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: unkin-net
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: unkin.net
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: main-unkin-net
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: main.unkin.net
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 13-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 13.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 14-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 14.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 15-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 15.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 16-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 16.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 17-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 17.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 19-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 19.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 20-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 20.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 21-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 21.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 22-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 22.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 23-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 23.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 24-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 24.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 25-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 25.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 26-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 26.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 27-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 27.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 28-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 28.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindZone
+metadata:
+  name: 29-18-198-in-addr-arpa
+  namespace: ns-auth
+spec:
+  clusterRef: auth
+  zoneName: 29.18.198.in-addr.arpa
+  type: primary
+  defaultTTL: 600

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

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