Use ocp/candidate-4.21 for 4.21 branch

[praveenkumar]

Since 4.21 is released and ocp-dev-preview only provide payload for non released version so better to use that. Also remove microshift pre release flag from ci script since that is also released.

Summary by CodeRabbit

• Chores
  • Updated CI pipeline configuration for release builds
  • Modified release version resolution to use stable mirror sources instead of development paths

[openshift-ci]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3eb83d8e-d394-4140-a294-2c6facaa2a33

📥 Commits

Reviewing files that changed from the base of the PR and between 4f08e09 and 0917f29.

📒 Files selected for processing (2)

• ci_microshift.sh
• snc.sh

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Walkthrough

These changes modify CI build configuration: removing the prerelease environment variable from microshift execution and updating mirror paths and release candidate versions in the installer version resolution logic.

Changes

Cohort / File(s)	Summary
CI Microshift Execution ci_microshift.sh	Removed MICROSHIFT_PRERELEASE=yes environment variable from the microshift script invocation, allowing the script to execute with default prerelease behavior disabled.
Installer Version Resolution snc.sh	Updated default mirror URL from ocp-dev-preview to ocp and changed release candidate path from candidate/ to candidate-4.21/, affecting which release version is resolved when OPENSHIFT_VERSION is unset.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• [4.20] Update mirror url and pre-release flag #1185 — Main PR containing the same code-level changes: removing MICROSHIFT_PRERELEASE invocation and updating mirror/candidate paths (targeting 4.21 vs 4.20).

Suggested reviewers

• anjannath
• gbraad

Poem

🐰 The prerelease flags have hopped away,
Mirror paths now show a brighter day,
Version four-point-twenty-one takes the stage,
Configuration scripts turn a newer page! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Use ocp/candidate-4.21 for 4.21 branch' directly and specifically summarizes the main change in snc.sh, which switches the mirror URL from ocp-dev-preview to ocp/candidate-4.21.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[praveenkumar]

/retest

[praveenkumar]

/retest

[openshift-ci]

@praveenkumar: 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/e2e-microshift	0917f29	link	true	/test e2e-microshift

Full PR test history. Your PR dashboard.

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