Publish an event source to your cluster

2. eval $(minikube docker-env)
   export KO_DOCKER_REPO=ko.local

4. apiVersion: serving.knative.dev/v1
   kind: Service
     namespace: knative-samples
   spec:
     template:
       spec:
         containers:
           - image: gcr.io/knative-releases/knative.dev/eventing/cmd/event_display
   ---
   apiVersion: samples.knative.dev/v1alpha1
   kind: SampleSource
     name: sample-source
     namespace: knative-samples
   spec:
     interval: "10s"
     sink:
       ref:
         apiVersion: serving.knative.dev/v1
         kind: Service
         name: event-display