model‑registry: add kubectl apply example for installation (#1071)

[Saketh1702]

Checklist:

• You have signed off your commits
• Ensure you follow best practices from our guide. Contributing.
• [] You have included screenshots when changing the website style or adding a new page.

Description of your changes:

This adds a “kubectl apply” snippet (and optional Istio compatibility) to the Model Registry installation docs.

Fixes kubeflow/model-registry#1071

Issue

Closes: kubeflow/model-registry#1071

Labels

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[google-oss-prow]

Hi @Saketh1702. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign ederign for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

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[Arhell]

/ok-to-test

[Saketh1702]

@Tomcli , @ederign , @varodrig requesting your permission for review

[juliusvonkohout]

Please sign the DCO or we will close the PR.

CC @tarilabs for review.

[tarilabs]

This pertains to UI installation instructions
/assign @ederign @lucferbux

[Saketh1702]

@juliusvonkohout what is DCO? and where is it?

[tarilabs]

see https://github.com/kubeflow/community/tree/master/dco-signoff-hook#signing-off-commits for DCO
( this guide is linked from kubeflow website, from here: https://www.kubeflow.org/docs/about/contributing/#getting-started )

[juliusvonkohout]

please point to the master branch not a version that is soon outdated.

[Saketh1702]

Yes will do!