E2e push operator

[HaoYang0000]

This PR add an action to check if docker image exists on remote internal repo(github private repo), if not we will push to it.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
6 out of 7 committers have signed the CLA.

:white_check_mark: jizhuoyu
:white_check_mark: roypaulin
:white_check_mark: fenic-fawkes
:white_check_mark: cchen-vertica
:white_check_mark: HaoYang0000
:white_check_mark: chinhtranvan
:x: spilchen

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[cchen-vertica]

The target branch should be main, not vnext2. In your PR, could you do me a favor to remove vnext from e2e.yml since vnext branch has been removed?

[HaoYang0000]

The target branch should be main, not vnext2. In your PR, could you do me a favor to remove vnext from e2e.yml since vnext branch has been removed?

Done, removed in https://github.com/vertica/vertica-kubernetes/pull/890/commits/47b732b9df1d6fc1d81b4ad0c39e49175c8422b0

[HaoYang0000]

Fix the CLA issue, create a new PR: https://github.com/vertica/vertica-kubernetes/pull/928