Add the sample scenario test in CI

[gold-kou]

Summary

I always do the regression test by executing the below commands since the tests in CI are not enough.

$ make kind-create
$ kubectl config use-context kind-gatling-cluster 
$ make build 
$ make install-crd 
$ make kind-deploy 
$ make kind-sample-deploy

I hope these commands are executed in CI.

[gold-kou]

I finally understand make kind-sample-deploy is almost same with gatling_controller_test.go .
That's why I close this issue.