add end-2-end tests that test core api server and plug-ins features

[gfichtenholt]

In addition to unit-tests we should also have end-2-end tests, where we stand up a cluster deploy carvel/flux on it test out our core and plug-in apis against that.

[gfichtenholt]

I think ideally, everybody contributing to core api server and/or plug-ins, including me, should part-own it, but I can take it if no-one else will

[absoludity]

I think ideally, everybody contributing to core api server and/or plug-ins, including me, should part-own it, but I can take it if no-one else will

+1, with the caveat that I'd be keen to focus this iteration on getting the unit tests there (and actually running those in CI - we're currently not running them in CI nor pushing an image to dockerhub), since we've committed to that. I'll move this to next iteration discussion, but no problem if we start it early.