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NO-JIRA: [RHCOS10] Test existing UBI9 base images on RHCOS10 nodes (no changes) #107

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NO-JIRA: [RHCOS10] Test existing UBI9 base images on RHCOS10 nodes (no changes) #107

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38 changes: 38 additions & 0 deletions docs/rhcos10-ubi9-compat-test.md
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# RHCOS10 UBI9 Compatibility Test

## Summary

Validate that the existing UBI9/RHEL9-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 RHEL9-based containers remain compatible before committing to a base image
migration.

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

## Images Under Test

| Image | Current Base |
|-------|-------------|
| `secrets-store-csi-driver-operator` | `registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.24-openshift-4.22` (builder) / `registry.ci.openshift.org/ocp/4.22:base-rhel9` (runtime) |
| `secrets-store-csi-driver-mustgather` | `registry.ci.openshift.org/ocp/4.22:must-gather` |

CI build root: `rhel-9-release-golang-1.24-openshift-4.22`

## Test Matrix

| Cluster | Test Suite | Expected |
|---------|-----------|---------|
| RHCOS10 | e2e-azure-rhcos10 | Pass |
| RHCOS10 | e2e-azure-rhcos10-fips | Pass |

## Expected Outcome

- All existing e2e tests pass on RHCOS10 nodes with UBI9-based images.
- No runtime compatibility issues between RHEL9 containers and RHCOS10 hosts.

## Follow-up

If CI passes → PR2 ([rhcos10-ubi10-migration](../)) migrates all base images from
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@coderabbitai coderabbitai bot Mar 27, 2026

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⚠️ Potential issue | 🟡 Minor

Fix the broken link to the follow-up PR.

The link [rhcos10-ubi10-migration](../) points only to the parent directory instead of a specific PR or document. This will be confusing for readers trying to navigate to the referenced migration work.

Consider one of these options:

  • Link to a specific issue/PR number if it exists (e.g., #108 or full URL)
  • Remove the link and use plain text if the PR hasn't been created yet: PR2 (rhcos10-ubi10-migration)
  • Link to a tracking issue or epic that will contain the migration 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` at line 37, The markdown link
"[rhcos10-ubi10-migration](../)" is pointing to the parent directory instead of
a specific PR or doc; update the link target for clarity by either replacing the
relative "../" target with the full URL or issue/PR number (e.g., the PR URL or
"#<PR_NUMBER>") or, if the PR doesn't exist yet, remove the markdown link and
make it plain text "PR2 (rhcos10-ubi10-migration)"; locate and edit the link
text "[rhcos10-ubi10-migration](../)" in docs/rhcos10-ubi9-compat-test.md to
apply the chosen fix.

UBI9/RHEL9 to UBI10/RHEL10.