docs: create redis-setup.md

[albarbaro]

Description

Add docs for Redis Cache setup

Which issue(s) does this PR fix

• Fixes RHIDP-5196

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[kim-tsao]

/lgtm

[JessicaJHee]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JessicaJHee, kim-tsao

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• OWNERS [JessicaJHee,kim-tsao]

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[JessicaJHee]

/override "PR Docker Build"

[openshift-ci]

@JessicaJHee: /override requires failed status contexts, check run or a prowjob name to operate on.
The following unknown contexts/checkruns were given:

• PR Docker Build

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• Build Image
• Build with Node.js 20
• Test with Node.js 20
• tide

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[JessicaJHee]

/override "Build Image"

[openshift-ci]

@JessicaJHee: Overrode contexts on behalf of JessicaJHee: Build Image

Details

In response to this:

/override "Build Image"

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.