Automate datadog krew plugin releasing

[clamoriniere]

What does this PR do?

Automate datadog krew plugin releasing in [krew-index|https://github.com/kubernetes-sigs/krew-index] repo.

It will generate automatically a PR, that will be merge automatically if only version,sha,uri change in the PR, like: kubernetes-sigs/krew-index#1433

Motivation

Limit releasing actions

Additional Notes

Anything else we should know when reviewing?

Describe your test plan

Difficult to test, from the action documentation, it will only public official release but not RC.

[github-actions]

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[clamoriniere]

It will generate automatically a PR, that will be merge automatically if only version,sha,uri change in the PR

[codecov-commenter]

Codecov Report

Merging #341 (91b3a76) into main (17569f7) will increase coverage by 25.81%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #341       +/-   ##
===========================================
+ Coverage   38.09%   63.90%   +25.81%     
===========================================
  Files          63       61        -2     
  Lines       11248     6705     -4543     
===========================================
  Hits         4285     4285               
+ Misses       6656     2113     -4543     
  Partials      307      307               

Flag	Coverage Δ
unittests	63.90% <ø> (+25.81%)	⬆️

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Impacted Files	Coverage Δ
api/v1alpha1/zz_generated.openapi.go
api/v1alpha1/zz_generated.deepcopy.go

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