NO-JIRA: [RHCOS10] Test existing UBI9 base images on RHCOS10 nodes (no changes)

[PillaiManish]

Summary

Validate that the existing UBI9-based images run correctly on RHCOS10 cluster nodes without any changes.

RHCOS10 ships with RHEL10 as its host OS. This PR triggers CI against an RHCOS10 cluster to confirm
UBI9 containers remain compatible before committing to a base image migration.

No Dockerfile changes. This is a baseline/smoke test only.

Follow-up

If CI passes → PR2 migrates all base images from UBI9 to UBI10.

[openshift-ci-robot]

@PillaiManish: This pull request explicitly references no jira issue.

Details

In response to this:

Summary

Validate that the existing UBI9-based images run correctly on RHCOS10 cluster nodes without any changes.

RHCOS10 ships with RHEL10 as its host OS. This PR triggers CI against an RHCOS10 cluster to confirm
UBI9 containers remain compatible before committing to a base image migration.

No Dockerfile changes. This is a baseline/smoke test only.

Follow-up

If CI passes → PR2 migrates all base images from UBI9 to UBI10.

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 openshift-eng/jira-lifecycle-plugin repository.

[coderabbitai]

Walkthrough

A new documentation file was added describing RHCOS10 compatibility CI validation. The document defines the scope of testing existing OpenShift OCP CI registry images currently pinned to RHEL9/4.20 on an RHCOS10 cluster and outlines the expected validation outcomes and follow-up migration plan.

Changes

Cohort / File(s)	Summary
Documentation docs/rhcos10-ubi9-compat-test.md	New documentation page outlining RHCOS10 compatibility CI validation scope, including tested images (secrets-store-csi, bats test runner, e2e provider), cluster/driver matrix definition, and planned follow-up for UBI10 base image migration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[coderabbitai]

🧹 Nitpick comments (1)

docs/rhcos10-ubi9-compat-test.md (1)

1-48: LGTM! Clear and well-structured documentation.

The document effectively explains the testing strategy, scope, and expected outcomes. The distinction between this compatibility test (PR1) and the future UBI10 migration (PR2) is clear.

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Optional: Consider adding CI configuration details and troubleshooting guidance.

While the current documentation serves its core purpose well, it could be enhanced with:

1. CI Configuration Reference: A brief section or link explaining how the RHCOS10 CI is triggered/configured would make the document more self-contained.
2. Troubleshooting/Rollback Plan: Guidance on how to interpret failures or what steps to take if incompatibilities are discovered.

These additions would improve usability but are not blockers for this PR.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@docs/rhcos10-ubi9-compat-test.md` around lines 1 - 48, Add two short sections
to this doc: a "CI Configuration Reference" that lists how RHCOS10 CI is
triggered (include the CI job names, the config file or repo used, and any
required prow/CI flags or labels to run the test) and a "Troubleshooting /
Rollback Plan" that gives brief steps to interpret failures (what logs to check,
common failure signatures) and the immediate rollback or mitigation actions and
owner/team to contact; reference PR1/PR2 and the rhcos10-ubi10-migration flow
where relevant so readers can follow the migration path.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@docs/rhcos10-ubi9-compat-test.md`:
- Around line 1-48: Add two short sections to this doc: a "CI Configuration
Reference" that lists how RHCOS10 CI is triggered (include the CI job names, the
config file or repo used, and any required prow/CI flags or labels to run the
test) and a "Troubleshooting / Rollback Plan" that gives brief steps to
interpret failures (what logs to check, common failure signatures) and the
immediate rollback or mitigation actions and owner/team to contact; reference
PR1/PR2 and the rhcos10-ubi10-migration flow where relevant so readers can
follow the migration path.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Plan: Pro

Run ID: b5aa2571-30d3-4d9a-bfdc-e009e253cdce

📥 Commits

Reviewing files that changed from the base of the PR and between b5d3f5c and 2497b23.

📒 Files selected for processing (1)

• docs/rhcos10-ubi9-compat-test.md

[PillaiManish]

/test e2e-azure-rhcos10-fips e2e-azure-rhcos10

[PillaiManish]

/test e2e-azure-rhcos10-fips

[openshift-ci]

@PillaiManish: all tests passed!

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