fix(dns): Add allow from everywhere network policy

This patch should add an "allow from everywhere" network policy for DNS
ports in order to allow the DNS service to function as intended.

This workaround is needed since the current network policy blocks all
traffic from outside the namespace, resulting in a non-working service.

apps/k8s01/dns/kustomization.yaml

@@ -4,5 +4,6 @@ namespace: dns
 resources:
   - namespace.yaml
   - dns.yaml
+  - networkpolicy.yaml
   - ../../../shared/networkpolicies/allow-from-same-namespace.yaml
   - ../../../shared/resourcequotas/default.yaml

apps/k8s01/dns/networkpolicy.yaml

+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-from-everywhere-to-do53
+spec:
+  podSelector:
+    matchLabels:
+      app: resolver
+  ingress:
+  - from:
+    - ipBlock:
+        cidr: 0.0.0.0/0
+    ports:
+      - protocol: UDP
+        port: 53
+      - protocol: TCP
+        port: 53