Ocpbugs-67196 cluster network mtu setting at deployment time

[elhadjici]

This PR is for setting cluster network MTU at deployment time for Spoke cluster. This is needed for uses case where partner would avoid MTU migration in day2 (minimum 2 reboot) and prefer to set the recommended default cluster network mtu or to set a buffer for MTU for future needs.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: elhadjici
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[openshift-ci]

Hi @elhadjici. Thanks for your PR.

I'm waiting for a openshift-kni 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.

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[imiller0]

/ok-to-test

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1a0ec085-216d-420f-84ad-8507bce1dc34

📥 Commits

Reviewing files that changed from the base of the PR and between dce2c0f and eb99875.

📒 Files selected for processing (1)

• telco-core/install/extra-manifests/Network.yaml

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📝 Walkthrough

Walkthrough

A new OpenShift Operator manifest file was added to configure the cluster's default network. The manifest defines a Network resource for OVN Kubernetes with a maximum transmission unit (MTU) set to 8900 bytes and includes deployment-related annotations.

Changes

Cohort / File(s)	Summary
OpenShift Network Configuration telco-core/install/extra-manifests/Network.yaml	New optional manifest defining a cluster Network resource configured with OVN Kubernetes CNI and MTU value of 8900.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically references the main change: setting cluster network MTU at deployment time for spoke clusters, directly matching the changeset which adds a Network manifest for MTU configuration.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose of setting cluster network MTU at deployment time to avoid day-2 migration costs, which matches the Network.yaml manifest addition.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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