[Sample] Fix samples

[machichima]

Why are these changes needed?

Found some bug in the sample yaml file while testing with v1.7.0-rc.0. This is the PR updating those YAML files.

1. ray-cronjob.sample.yaml: didn't set request, so it will use up to 5Gi (limit). Set request and limit to 2Gi (this value comes from ray-job.sample.yaml)
   

   kuberay/ray-operator/config/samples/ray-job.sample.yaml

   Lines 66 to 68 in 46d4f23

   	requests:
   	cpu: "1"
   	memory: "2Gi"

2. ray-cluster.kubernetes.auth.yaml and ray-cluster.kubernetes.auth-manual.yaml: set to newest ray image (2.57.0) rather than nightly

3. Update ray-cluster.embedded-gcs-ft.yaml to use newest ray image 2.57.0 as this feature is added in 2.57 rather than 2.52

4. ray-operator/config/samples/ray-cluster.head-command.yaml comment link to markdown file that does not exists, remove the comment

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• If this PR has user-facing changes that require documentation updates at release time, I have added the doc-updates-required label.
• If this PR contains breaking changes, I have added the breaking-change label.

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  • Manual tests
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Manual test instructions

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{Reviewed by Cursor Bugbot for commit aebc8d9. Configure here.}

[cursor]

Head memory limit reduced incorrectly

Medium Severity

The head container memory limit was lowered from 5Gi to 2Gi while adding a 2Gi request. The cited ray-job.sample.yaml keeps limit 5Gi and request 2Gi, and sibling samples like ray-cronjob-timezone.sample.yaml still use a 5Gi head limit. A tighter limit can OOM the Ray head (GCS/dashboard) for users following this sample.

 

^{Reviewed by Cursor Bugbot for commit aebc8d9. Configure here.}

[win5923]

cc @machichima to also fix the ray-cronjob-timezone.sample.yaml.

[machichima]

Thank you! Updated

[win5923]

cc @machichima to also fix the ray-cronjob-timezone.sample.yaml.