DPTP-4340: Remove direct mirroring to registry.ci.openshift.org, consolidate to single promotion step

[deepsm007]

Removes the direct mirroring step to registry.ci.openshift.org and consolidates promotion into a single step that handles both quay.io mirroring and tagging.

The promotion now:
(1) mirrors to quay.io/openshift/ci using oc image mirror, then
(2) tags in registry.ci.openshift.org from quay-proxy.ci.openshift.org using oc tag.

/hold
/cc @Prucek @openshift/test-platform

[openshift-ci-robot]

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[openshift-ci-robot]

@deepsm007: This pull request references DPTP-4340 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 story to target the "4.21.0" version, but no target version was set.

Details

In response to this:

Removes the direct mirroring step to registry.ci.openshift.org and consolidates promotion into a single step that handles both quay.io mirroring and tagging.

The promotion now:
(1) mirrors to quay.io/openshift/ci using oc image mirror, then
(2) tags in registry.ci.openshift.org from quay-proxy.ci.openshift.org using oc tag.

/hold
/cc @Prucek @openshift/test-platform

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[coderabbitai]

Walkthrough

Removed the generic promotion step from defaults; promotion is now handled only via the quay-specific promotion path (and logging when RegistryOverride is set), with corresponding test expectation updated.

Changes

Cohort / File(s)	Change Summary
Defaults implementation pkg/defaults/defaults.go	Removed addition of a generic promotion step that used registryDomain(config.PromotionConfiguration), api.DefaultMirrorFunc, and api.DefaultTargetNameFunc; flow now relies on the quay-specific promotion step or logs when RegistryOverride prevents promotion.
Unit test update pkg/defaults/defaults_test.go	Updated TestFromConfig "promote" case to expect only "[promotion-quay]" in post-build steps (removed expectation of standalone "[promotion]").

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Inspect pkg/defaults/defaults.go to ensure no remaining references assume the generic promotion step exists.
• Run/verify updated unit test pkg/defaults/defaults_test.go and check for other tests that might assert the old behavior.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📥 Commits

Reviewing files that changed from the base of the PR and between 6f270d2 and 661cd2f.

📒 Files selected for processing (1)

• pkg/defaults/defaults_test.go (1 hunks)

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Files:

• pkg/defaults/defaults_test.go

🔇 Additional comments (1)

pkg/defaults/defaults_test.go (1)

1736-1736: LGTM! Test expectation correctly updated.

The test expectation now reflects the consolidated promotion flow where only the [promotion-quay] step executes post-build, removing the redundant generic [promotion] step. This aligns with the PR objective to consolidate promotion into a single step.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deepsm007

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[deepsm007]

/pipeline required

[openshift-ci-robot]

Scheduling required tests:
/test e2e

Scheduling tests matching the pipeline_run_if_changed or not excluded by pipeline_skip_if_only_changed parameters:
/test integration-optional-test

[openshift-ci]

@deepsm007: 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/breaking-changes	661cd2f	link	false	/test breaking-changes

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[Prucek]

when we merge this only the X.Y-quay IS will stay, is that what we want? Or do we want the current X.Y IS to use QCI images https://github.com/openshift/ci-tools/blob/main/pkg/api/promotion.go#L114