OCM-22871 | chore: bump ROSA CI build root to Go 1.26

[olucasfreitas]

Summary

• bump the openshift/rosa ci-operator build root from rhel-9-golang-1.24-openshift-4.21 to rhel-9-golang-1.26-openshift-4.21
• align ROSA Prow build, lint, and test presubmits with the Go 1.26.1 requirement now declared in the ROSA repository
• fix the external CI drift that is currently blocking ROSA PR validation

Why

ROSA PR openshift/rosa#3229 updates the repo to Go 1.26.1 to remediate CVE-2026-25679.

The repo-local changes are green under local verification and Konflux, but the external Prow presubmits are still booting with the old build root:

build_root:
  image_stream_tag:
    tag: rhel-9-golang-1.24-openshift-4.21

That causes the Prow jobs to fail before they can validate the ROSA code changes. The failing logs on openshift/rosa#3229 show:

go.mod requires go >= 1.26.1 (running go 1.24.13; GOTOOLCHAIN=local)

and:

golangci-lint.mod requires go >= 1.26.1 (running go 1.24.13)

Validation

• inspected the current ci-operator config for openshift/rosa
• confirmed the failing build, lint, and test Prow logs on openshift/rosa#3229 are all caused by the stale Go 1.24 build root
• kept this PR minimal to match ROSA's previous ci-operator Go version bumps in this same file

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@olucasfreitas: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-openshift-rosa-master-build	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-commits	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-coverage	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-images	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-hcp-advanced	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-hcp-arm	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-hcp-private-link	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-shared-vpc	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-sts-advanced	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-sts-private-link	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-e2e-presubmits-pr-rosa-sts-shared-vpc	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-images-images	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-images-release-images	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-lint	openshift/rosa	presubmit	Ci-operator config changed
pull-ci-openshift-rosa-master-test	openshift/rosa	presubmit	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-hcp-external-auth-medium-low-f7	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-hibernation-f14	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-advanced-prod-critical-high-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-shared-vpc-critical-high-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-hcp-advanced-critical-high-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-hcp-upgrade-z-stream-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-shared-vpc-upgrade-y-stream-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-hcp-upgrade-y-stream-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-private-link-critical-high-f3	N/A	periodic	Ci-operator config changed
periodic-ci-openshift-rosa-master-e2e-rosa-sts-private-link-medium-low-f7	N/A	periodic	Ci-operator config changed

A total of 44 jobs have been affected by this change. The above listing is non-exhaustive and limited to 25 jobs.

A full list of affected jobs can be found here
Prior to this PR being merged, you will need to either run and acknowledge or opt to skip these rehearsals.

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
Comment: /pj-rehearse skip to opt-out of rehearsals
Comment: /pj-rehearse {test-name}, with each test separated by a space, to run one or more specific rehearsals
Comment: /pj-rehearse more to run up to 10 rehearsals
Comment: /pj-rehearse max to run up to 25 rehearsals
Comment: /pj-rehearse auto-ack to run up to 5 rehearsals, and add the rehearsals-ack label on success
Comment: /pj-rehearse list to get an up-to-date list of affected jobs
Comment: /pj-rehearse abort to abort all active rehearsals
Comment: /pj-rehearse network-access-allowed to allow rehearsals of tests that have the restrict_network_access field set to false. This must be executed by an openshift org member who is not the PR author

Once you are satisfied with the results of the rehearsals, comment: /pj-rehearse ack to unblock merge. When the rehearsals-ack label is present on your PR, merge will no longer be blocked by rehearsals.
If you would like the rehearsals-ack label removed, comment: /pj-rehearse reject to re-block merging.

[amandahla]

Suggestion: change to use this as well #76985

[amandahla]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amandahla, olucasfreitas

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

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Details

Needs approval from an approver in each of these files:

• ci-operator/config/openshift/rosa/OWNERS [olucasfreitas]

Approvers can indicate their approval by writing /approve in a comment
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[olucasfreitas]

/pj-rehearse ack

[openshift-ci-robot]

@olucasfreitas: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[openshift-ci]

@olucasfreitas: all tests passed!

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