Added greetings workflow

[antedotee]

I have added a greetings workflow. Now, if some new contributor raises the issue or a PR for the first time, he/she will get an automated thank you message.

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Per0x1de-1337]

@antedotee please fix the failing checks.

[Per0x1de-1337]

/ok-to-test

[kubestellar-prow]

@antedotee: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubestellar-a2a-verify	1039f27	link	true	/test pull-kubestellar-a2a-verify
pull-kubestellar-a2a-verify-py312	1039f27	link	true	/test pull-kubestellar-a2a-verify-py312

Full PR test history

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[MAVRICK-1]

/approve