feat: manage externaldns bind (#428)

- add module to manage externaldns bind for k8s
- add infra::dns::externaldns role
- add 198.18.19.20 as anycast for k8s external-dns service

Reviewed-on: #428

hieradata/roles/infra/dns/resolver.yaml

@@ -82,6 +82,11 @@ profiles::dns::resolver::zones:
       - 10.10.16.32
       - 10.10.16.33
     forward: 'only'
+  k8s.syd1.au.unkin.net-forward:
+    domain: 'k8s.syd1.au.unkin.net'
+    zone_type: 'forward'
+    forwarders: "%{alias('profiles_dns_upstream_forwarder_k8s')}"
+    forward: 'only'
   unkin.net-forward:
     domain: 'unkin.net'
     zone_type: 'forward'
@@ -172,6 +177,11 @@ profiles::dns::resolver::zones:
     zone_type: 'forward'
     forwarders: "%{alias('profiles_dns_upstream_forwarder_unkin')}"
     forward: 'only'
+  200.18.198.in-addr.arpa-forward:
+    domain: '200.18.198.in-addr.arpa'
+    zone_type: 'forward'
+    forwarders: "%{alias('profiles_dns_upstream_forwarder_k8s')}"
+    forward: 'only'
   consul-forward:
     domain: 'consul'
     zone_type: 'forward'
@@ -188,6 +198,7 @@ profiles::dns::resolver::views:
       - network.unkin.net-forward
       - prod.unkin.net-forward
       - consul-forward
+      - k8s.syd1.au.unkin.net-forward
       - 13.18.198.in-addr.arpa-forward
       - 14.18.198.in-addr.arpa-forward
       - 15.18.198.in-addr.arpa-forward