feat: manage the cilium l2 config with flux (#827)

Signed-off-by: Devin Buhl <devin@buhl.casa>

kubernetes/apps/kube-system/cilium/app/cilium-l2.yaml

@@ -0,0 +1,22 @@
+---
+# https://docs.cilium.io/en/latest/network/l2-announcements
+apiVersion: cilium.io/v2alpha1
+kind: CiliumL2AnnouncementPolicy
+metadata:
+  name: policy
+spec:
+  loadBalancerIPs: true
+  # NOTE: This might need to be set if you have more than one active NIC on your nodes
+  # interfaces:
+  #   - ^eno[0-9]+
+  nodeSelector:
+    matchLabels:
+      kubernetes.io/os: linux
+---
+apiVersion: cilium.io/v2alpha1
+kind: CiliumLoadBalancerIPPool
+metadata:
+  name: pool
+spec:
+  cidrs:
+    - cidr: "${NODE_CIDR}"

kubernetes/apps/kube-system/cilium/app/kustomization.yaml

@@ -3,4 +3,5 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 namespace: kube-system
 resources:
+  - ./cilium-l2.yaml
   - ./helmrelease.yaml