Basic Serverless, auto scale up & scale down by request

Prerequisite

From Topology view, open web terminal, delete route, service and deployment of backend with below command (change project name to your project name such as 'userx')
```
oc project user1
oc delete route/backend
oc delete service/backend
oc delete deployment/backend
```
redeploy application again with openshift serverless (serving) feature, click Add+ in left menu, select deploy from container images
in image section, select Image stream tag from internal registry, select project 'userx' (your username), image stream 'backend' and Tag 'latest'
in general section, set Application name: 'backend', Name: 'backend'
in resources seciton, select 'Serverless Deployment'
for advanced options, leave all default, click create
wait until deploy complete, click KSVC 'backend'
test backend application click route icon to open application in new tab
wait until application auto scale down (1 minute)
in topology view, no pod start and deployment show 0 pod
test call application again by click route, serverless will automatic start pod.