Integrate krel push into anago and test-infra

[saschagrunert]

Current state

• The deprecated build scenario k/test-infra kubernetes_build scenario is still in use and uses push-build.sh from k/release.
• kubetest has a --stage flag which is also using push-build.sh.

The Plan

1. Add another flag to kubetest to be able to test via krel push. This incorporates a refactoring to move the whole logic of krel push into the library. Because kubetest is written in go, we then can just use k/release as a library.
2. Add a new job similar to the existing k/release jobs to not trigger --stage, but the new flag to run via krel.

Todos

• Move krel push into the library (Move krel push logic into release API #1579)
• Implement krel anago push and integrate it into anago
• Integrate krel push into kubetest (Allow staging via krel for kubetest test-infra#19328, Stage sources via k/release API (krel) kubernetes-sigs/kubetest2#61, Allow staging via krel for kubetest test-infra#19488)
• Add a test job in test-infra to run krel push

[saschagrunert]

I consider this as done, since I'm not sure if the integration into kubetest (1) is still necessary and kubetest2 already uses the new implementation.
/close

[k8s-ci-robot]

@saschagrunert: Closing this issue.

In response to this:

I consider this as done, since I'm not sure if the integration into kubetest (1) is still necessary and kubetest2 already uses the new implementation.
/close

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