Add GRPC liveness/readiness/startup_probe

[dgnemo]

Description

Add GRPC liveness/readiness/startup_probe

see: https://github.com/bowei/enhancements/blob/master/keps/sig-node/2727-grpc-probe/

Feature Request: #1908

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccKubernetesPod_with_container_liveness_probe_using_grpc'
==> Checking that code complies with gofmt requirements...
go vet .
TF_ACC=1 go test "/home/diego/github/terraform-provider-kubernetes/kubernetes" -v -run=TestAccKubernetesPod_with_container_liveness_probe_using_grpc -timeout 3h
=== RUN   TestAccKubernetesPod_with_container_liveness_probe_using_grpc
--- PASS: TestAccKubernetesPod_with_container_liveness_probe_using_grpc (11.30s)
PASS
ok      github.com/hashicorp/terraform-provider-kubernetes/kubernetes   11.342s

Release Note

Release note for CHANGELOG:

Add support for GRPC probes.  KEP-2727

References

K8s feature:

• Add gRPC probe to Pod.Spec.Container.{Liveness,Readiness,Startup}Probe kubernetes/enhancements#2727
• https://github.com/bowei/enhancements/blob/master/keps/sig-node/2727-grpc-probe/
• Implement grpc probe action kubernetes/kubernetes#106463

Feature Request: #1908

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• If you are interested in working on this issue or have submitted a pull request, please leave a comment

[hashicorp-cla]

All committers have signed the CLA.

[arybolovlev]

Hi @dgnemo,

All looks good, just one more query from my end.

Could you please add a changelog file so we can then auto-generate change log for the upcoming release?

It will be a simple text file in .changelog folder. Like this: .changelog/1915.txt. With the following content:

```release-note:enhancement
Add a new optional attribute `grpc` to `pod.spec.container.liveness_probe`, `pod.spec.container.readiness_probe`, and `pod.spec.container.startup_probe`. That affects all resources and data sources that use mentioned `pod.spec.container` probes directly or as a template.
```

Thank you! 👍🏻

[dgnemo]

Thanks @arybolovlev

Added the changelog.

[arybolovlev]

Hi @dgnemo,

Looks great! Thank you and congratulations on the first-time contribution to the Kubernetes provider! 🎉

Your changes will be available in the upcoming release. Please keep an eye on the release notes.