Enable custom extensions: example (#3571)

Author: pbochynski

examples/custom-extension/README.md

@@ -4,7 +4,13 @@ This example contains a basic custom extension that queries all deployments of a
 
 To set up and deploy your own custom Busola extension, follow these steps.
 
-1. Adjust the static HTML content.
+1. Enable custom extensions in your cluster:
+
+```
+kubectl apply -f busola-config.yaml
+```
+
+2. Adjust the static HTML content.
 
 Edit the `ui.html` file to define the static HTML content for your custom extension.
 

examples/custom-extension/busola-config.yaml

@@ -0,0 +1,11 @@
+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: busola-config
+  namespace: kube-public
+data:
+  config: |
+    config:
+      features:
+        EXTENSIBILITY_CUSTOM_COMPONENTS:
+          isEnabled: true