Enhance CI with basic integration test

[SamYuan1990]

Is your feature request related to a problem? Please describe. So far, we just verify by until kubectl get svc --all-namespaces ... to make it better, we'd better have a test suite and targeting on running service.

Describe the solution you'd like as above.

Describe alternatives you've considered N/A

Additional context N/A

[rootfs]

The service readiness detection is to be supported in kepler-operator

[SamYuan1990]

The service readiness detection is to be supported in kepler-operator

so what's our scope of integration test?

[sallyom]

this issue is folded into https://github.com/sustainable-computing-io/kepler/issues/350, closing here and moving conversation to #350 tracked on the Project Board