Add information about Kubernetes native workers

[adamconnelly]

Description of the change

I've added some info about how to install and configure the Spacelift workerpool operator for Kubernetes.

Checklist

Please make sure that the proposed change checks all the boxes below before requesting a review:

• I have reviewed the guidelines for contributing to this repository.
• The preview looks fine.
• The tests pass.
• The commit history is clean and meaningful.
• The pull request is opened against the main branch.
• The pull request is no longer marked as a draft.
• You agree to license your contribution under the MIT license to Spacelift (not required for Spacelift employees).
• You have updated the navigation files correctly:
  • No new pages have been added, or;
  • Only nav.yaml has been updated because the changes only apply to SaaS, or;
  • Only nav.self-hosted.yaml has been updated because the changes only apply to Self-Hosted, or;
  • Both nav.yaml and nav.self-hosted.yaml have been updated.

If the proposed change is ready to be merged, please request a review from @spacelift-io/solutions-engineering. Someone will review and merge the pull request.

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Thank you for your contribution! 🙇

[render]

Your Render PR Server URL is https://spacelift-user-documentation-pr-401.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cln4oroapebc739hnfbg.

[eliecharra]

You could still reconvert to be an author the day software engineering will piss you off. This doc is great 👍🏻

[adamconnelly]

You could still reconvert to be an author the day software engineering will piss you off. This doc is great 👍🏻

Thanks @eliecharra - you're too kind ❤️

[eliecharra]

The controller has been released, I restarted the check so now it's ✅ .

[eminalemdar]

LGTM!