[docs] Right steps for secret creation in generate-pipeline flow. (#…

…3180)

* Right steps for secret creation

* Add pipeline run

* fix formatting

examples/generate-pipeline/README.adoc

@@ -8,7 +8,7 @@ _Please keep in mind that the generate-pipeline command is still a WIP_
 Prerequisites:
 
 * Install tekton on your cluster (https://github.com/tektoncd/pipeline/blob/master/docs/install.md)
-* Have kaniko secrets setup (https://github.com/GoogleContainerTools/kaniko)
+* Have kaniko secrets setup and installed in your cluster (https://github.com/GoogleContainerTools/kaniko#kubernetes-secret)
 * Container registry must be public
 * Give your default service account the cluster-admin role (necessary to have pipeline access secrets)
 ----
@@ -20,8 +20,22 @@ kubectl create clusterrolebinding serviceaccounts-cluster-admin \
 To generate and run a pipeline:
 
 * Run skaffold generate-pipeline
-* Modify skaffold.yaml to use a valid GCSbucket for kaniko
+* Modify skaffold.yaml to use a valid GCSbucket for kaniko if needed.
 * Commit and push updated skaffold.yaml
 * kubectl apply -f pipeline.yaml
-* Create a pipelinerun.yaml
+* Create a pipelinerun.yaml 
+----
+apiVersion: tekton.dev/v1alpha1
+kind: PipelineRun
+metadata:
+  name: skaffold-pipeline-run
+spec: 
+  pipelineRef: 
+    name: skaffold-pipeline
+  resources:
+  - name: source-repo
+    resourceRef:
+      name: source-git
+----
+ 
 * kubectl apply -f pipelinerun.yaml