feat(cluster): add treafik middleware for local only access

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

cluster/apps/networking/traefik/kustomization.yaml

@@ -4,3 +4,4 @@ kind: Kustomization
 resources:
   - helm-release.yaml
   - dashboard
+  - middlewares

cluster/apps/networking/traefik/middlewares/kustomization.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - local-only-access.yaml

cluster/apps/networking/traefik/middlewares/local-only-access.yaml

@@ -0,0 +1,22 @@
+---
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: rfc1918-ips
+  namespace: networking
+spec:
+  ipWhiteList:
+    sourceRange:
+      - 10.0.0.0/8
+      - 172.16.0.0/12
+      - 192.168.0.0/16
+---
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: local-only-access
+  namespace: networking
+spec:
+  chain:
+    middlewares:
+      - name: rfc1918-ips