Restrict authoritative queries to internal networks (#227)

Mirrors the puppet authoritative `master-zones` view (match-clients `acl-main.unkin.net`, recursion no) — restricting who can query bind-authoritative.

## Changes
- add `auth-acl-main` BindACL with the puppet authoritative acl-main.unkin.net networks (13-17,19,20,24-29)
- `allow-query { auth-acl-main; 10.42.0.0/16; }` on bind-authoritative via extraOptions

## Notes
- Implemented as a global `allow-query` rather than a BindView: dynamic *primary* zones inside a view would need per-view `allow-new-zones` (an operator gap). Functionally equivalent for the single master-zones view.
- `10.42.0.0/16` (pod network) is included so secondaries can SOA-refresh from the primary during catalog replication — without it, replication breaks.
- Works on the current operator (no HOLD).

## Caveat
The DNS Services use externalTrafficPolicy: Cluster, which SNATs external clients to node IPs (198.18.19.x, already in acl-main), so this ACL doesn't truly restrict *external* clients yet. True source-IP restriction needs externalTrafficPolicy: Local — happy to switch if wanted.

Reviewed-on: #227
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/base/bind-internal/authoritative/acls.yaml

@@ -0,0 +1,26 @@
+---
+# Internal client networks allowed to query the authoritative servers,
+# mirrored from the puppet authoritative /etc/named/acls.conf
+# (acl-main.unkin.net). Named auth-acl-main because the resolver has its own,
+# differently-scoped acl-main.unkin.net in the same namespace.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindACL
+metadata:
+  name: auth-acl-main
+  namespace: bind-internal
+spec:
+  clusterRef: bind-authoritative
+  entries:
+    - 198.18.13.0/24
+    - 198.18.14.0/24
+    - 198.18.15.0/24
+    - 198.18.16.0/24
+    - 198.18.17.0/24
+    - 198.18.19.0/24
+    - 198.18.20.0/24
+    - 198.18.24.0/24
+    - 198.18.25.0/24
+    - 198.18.26.0/24
+    - 198.18.27.0/24
+    - 198.18.28.0/24
+    - 198.18.29.0/24

apps/base/bind-internal/authoritative/cluster.yaml

@@ -11,6 +11,11 @@ spec:
   replicas: 3
   storageClassName: cephrbd-fast-delete
   storageSize: 2Gi
+  # Restrict queries to internal networks (puppet acl-main.unkin.net).
+  # 10.42.0.0/16 (pod net) is required so secondaries can SOA-refresh
+  # from the primary during catalog replication.
+  extraOptions:
+    - "allow-query { auth-acl-main; 10.42.0.0/16; }"
   service:
     type: LoadBalancer
     annotations:

apps/base/bind-internal/authoritative/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
   - cluster.yaml
   - tsigkey.yaml
   - zones.yaml
+  - acls.yaml