ART-18422: Pin imagebuilder to v1.2.20 for ci-openshift-build-root-extra.rhel9 (4.16)

[joepvd]

Summary

Pin openshift/imagebuilder to v1.2.20 in the CI build root extra Dockerfile.
imagebuilder v1.2.21 bumped its go.mod to require Go >= 1.25.5, but openshift-4.16
uses Go 1.23.10 with GOTOOLCHAIN=local, causing all builds to fail.

Failing build: https://art-build-history-art-build-history.apps.artc2023.pc3z.p1.openshiftapps.com/?name=^ci-openshift-build-root-extra.rhel9$&group=openshift-4.16&assembly=stream&engine=konflux&dateRange=2026-02-10+to+2026-05-11&outcome=success&outcome=failure

Analysis

The build fails at:

go: github.com/openshift/imagebuilder/cmd/imagebuilder@latest:
  github.com/openshift/imagebuilder@v1.2.21 requires go >= 1.25.5
  (running go 1.23.10; GOTOOLCHAIN=local)

v1.2.20 requires Go 1.23.3 (compatible with Go 1.23.10 in the 4.16 build env).

Changes

• Pin imagebuilder@latest to imagebuilder@v1.2.20 in ci_images/rhel-9/ci-openshift-build-root/Dockerfile.extra

Generated with Claude Code

[openshift-ci-robot]

@joepvd: This pull request references ART-18422 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.16.z" version, but no target version was set.

Details

In response to this:

Summary

Pin openshift/imagebuilder to v1.2.20 in the CI build root extra Dockerfile.
imagebuilder v1.2.21 bumped its go.mod to require Go >= 1.25.5, but openshift-4.16
uses Go 1.23.10 with GOTOOLCHAIN=local, causing all builds to fail.

Failing build: https://art-build-history-art-build-history.apps.artc2023.pc3z.p1.openshiftapps.com/?name=^ci-openshift-build-root-extra.rhel9$&group=openshift-4.16&assembly=stream&engine=konflux&dateRange=2026-02-10+to+2026-05-11&outcome=success&outcome=failure

Analysis

The build fails at:

go: github.com/openshift/imagebuilder/cmd/imagebuilder@latest:
 github.com/openshift/imagebuilder@v1.2.21 requires go >= 1.25.5
 (running go 1.23.10; GOTOOLCHAIN=local)

v1.2.20 requires Go 1.23.3 (compatible with Go 1.23.10 in the 4.16 build env).

Changes

• Pin imagebuilder@latest to imagebuilder@v1.2.20 in ci_images/rhel-9/ci-openshift-build-root/Dockerfile.extra

Generated with Claude Code

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[joepvd]

Triggered seed-lockfile test build #390 to verify this fix.

[openshift-ci]

@joepvd: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/art-pre-commit-check	23dd9c7	link	false	/test art-pre-commit-check

Full PR test history. Your PR dashboard.

Details

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[joepvd]

Seed-lockfile build #390 failed as expected — for ci_images, the source Dockerfile is cloned from the mainline openshift-4.16 branch of openshift-priv/ocp-build-data, not from the data-path override. So the test build still used the unfixed Dockerfile with @latest.

This PR cannot be validated via seed-lockfile. The fix is straightforward — pin imagebuilder@latest to @v1.2.20 to avoid the Go >= 1.25.5 requirement from v1.2.21. Needs lgtm and direct merge.