Add EBS-backed Ephemeral Volume example to documentation

[AndrewSirenko]

What type of PR is this?

/kind documentation

What is this PR about? / Why do we need it?

Add EBS-backed Ephemeral Volume example to documentation to better support users like those in #1964.

How was this change tested?

Worked through example

Does this PR introduce a user-facing change?

Add EBS-backed Generic Ephemeral Volume example

[github-actions]

Code Coverage Diff

This PR does not change the code coverage

[ElijahQuinones]

Ran through example on test cluster and confirmed it works as intended

❯ kubectl apply -f mans
pod/app created
storageclass.storage.k8s.io/ebs-ephemeral-demo created

❯ kubectl get pvc app-persistent-storage
NAME                     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS         VOLUMEATTRIBUTESCLASS   AGE
app-persistent-storage   Bound    pvc-56216e78-f3e7-4319-a3b2-b83035258d4f   1Gi        RWO            ebs-ephemeral-demo   <unset>                 73s

❯ kubectl exec app -- cat /data/out.txt
Mon Jan 27 16:54:16 UTC 2025
Mon Jan 27 16:54:21 UTC 2025
Mon Jan 27 16:54:26 UTC 2025
Mon Jan 27 16:54:31 UTC 2025
Mon Jan 27 16:54:36 UTC 2025
Mon Jan 27 16:54:41 UTC 2025
Mon Jan 27 16:54:46 UTC 2025
Mon Jan 27 16:54:51 UTC 2025
Mon Jan 27 16:54:56 UTC 2025
Mon Jan 27 16:55:01 UTC 2025
Mon Jan 27 16:55:06 UTC 2025
Mon Jan 27 16:55:11 UTC 2025
Mon Jan 27 16:55:16 UTC 2025
Mon Jan 27 16:55:21 UTC 2025
Mon Jan 27 16:55:26 UTC 2025

❯ kubectl delete -f mans
pod "app" deleted
storageclass.storage.k8s.io "ebs-ephemeral-demo" deleted

❯ kubectl get pvc app-persistent-storage
Error from server (NotFound): persistentvolumeclaims "app-persistent-storage" not found

❯ kubectl get pv pvc-56216e78-f3e7-4319-a3b2-b83035258d4f
Error from server (NotFound): persistentvolumes "pvc-56216e78-f3e7-4319-a3b2-b83035258d4f" not found

/lgtm

minus the one minor nit

[ElijahQuinones]

/lgtm
/approve

[AndrewSirenko]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AndrewSirenko, ElijahQuinones

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