Add Kubernetes Gateway Provider

Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com>

docs/content/reference/dynamic-configuration/kubernetes-whoami-svc.yml

@@ -0,0 +1,32 @@
+---
+kind: Deployment
+apiVersion: apps/v1
+metadata:
+  name: whoami
+
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: whoami
+  template:
+    metadata:
+      labels:
+        app: whoami
+    spec:
+      containers:
+        - name: whoami
+          image: traefik/whoami
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami
+
+spec:
+  ports:
+    - protocol: TCP
+      port: 80
+  selector:
+    app: whoami