🐛 add rollingUpdate strategy

[jianzhangbjz]

Description

To address the issue: the cluster operator olm Available=False when cluster upgrading.
I have tested this solution in openshift/operator-framework-operator-controller#515, and it works.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[jianzhangbjz]

https://github.com/operator-framework/operator-controller/actions/runs/18452353047/job/52567797659?pr=2263 failed at:

 cluster_extension_install_test.go:1052: ByeventuallyreportingProgressing==TruewithReasonRetrying
cluster_extension_install_test.go:1053: ErrorTrace:	/home/runner/work/operator-controller/operator-controller/test/e2e/cluster_extension_install_test.go:1058/opt/hostedtoolcache/go/1.24.4/x64/src/runtime/asm_amd64.s:1700
Error: Not equal: expected: "Retrying"
actual : "RolloutInProgress"
Diff:
---Expected+++Actual
@@ -1+1 @@
-Retrying+RolloutInProgress
cluster_extension_install_test.go:1053: ErrorTrace:	/home/runner/work/operator-controller/operator-controller/test/e2e/cluster_extension_install_test.go:1053
Error: Conditionneversatisfied
Test: TestClusterExtensionRecoversFromExistingDeploymentWhenFailureFixed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.87%. Comparing base (95c5934) to head (9e5978e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #2263 +/- ##
=======================================
Coverage 72.87% 72.87% =======================================
Files 88 88 Lines 8733 8733 =======================================
Hits 6364 6364 Misses 1955 1955 Partials 414 414 

Flag	Coverage Δ
e2e	39.29% <ø> (+0.03%)	⬆️
experimental-e2e	46.31% <ø> (ø)
unit	57.99% <ø> (ø)

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[tmshort]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tmshort

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• helm/OWNERS [tmshort]
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[tmshort]

https://github.com/operator-framework/operator-controller/actions/runs/18452353047/job/52567797659?pr=2263 failed at...
@jianzhangbjz this is an uncommon flake... to the point we usually just run the test again and it passes.

[openshift-merge-robot]

Fix included in accepted release 4.21.0-0.nightly-2025-10-15-101012