feat(thelounge): add cilium egress filtering

Allow: DNS, LDAP (authentik), in-cluster ZNC, irc.passthepopcorn.me:6697.
Default-deny for everything else.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

thelounge/ciliumnetworkpolicy.yaml

@@ -0,0 +1,44 @@
+apiVersion: cilium.io/v2
+kind: CiliumNetworkPolicy
+metadata:
+  name: thelounge-egress
+  namespace: irc
+spec:
+  endpointSelector:
+    matchLabels:
+      app.kubernetes.io/name: thelounge
+  egress:
+  - toEndpoints:
+    - matchLabels:
+        k8s:io.kubernetes.pod.namespace: kube-system
+        k8s:k8s-app: kube-dns
+    toPorts:
+    - ports:
+      - port: "53"
+        protocol: ANY
+      rules:
+        dns:
+        - matchPattern: "*"
+  - toEndpoints:
+    - matchLabels:
+        k8s:io.kubernetes.pod.namespace: auth
+        k8s:app.kubernetes.io/name: authentik-outpost-ldap
+        k8s:goauthentik.io/outpost-type: ldap
+    toPorts:
+    - ports:
+      - port: "389"
+        protocol: TCP
+  - toEndpoints:
+    - matchLabels:
+        k8s:io.kubernetes.pod.namespace: irc
+        k8s:app.kubernetes.io/name: znc
+    toPorts:
+    - ports:
+      - port: "6501"
+        protocol: TCP
+  - toFQDNs:
+    - matchName: "irc.passthepopcorn.me"
+    toPorts:
+    - ports:
+      - port: "6697"
+        protocol: TCP

thelounge/kustomization.yaml

@@ -5,4 +5,5 @@ resources:
   - service.yaml
   - httproute.yaml
   - authorizationpolicy.yaml
+  - ciliumnetworkpolicy.yaml
   - config.yaml