Make `kubedev generate` use specific `check`s in CI

[daniel-kun]

Currently, kubedev generate adds a plain "kubedev check" to the build-and-push and deploy jobs.

It should use more specific checks, i.e. "kubedev check build" and "kubedev check deploy", because there can be situations where env vars required for the deploy are not available in the build job - which is perfectly fine, but currently bails out.