ACM-37663: Rebase hypershift operator runtime image to RHEL 9.8 ELS

[yiraeChristineKim]

Jira: ACM-37663

Summary

• Rebase Containerfile.operator runtime stage from rhel9-4-els/rhel:9.4 to rhel9-8-els/rhel:9.8
• The 9.4 ELS base is no longer supported/receiving updates; MCE 2.8 operator builds need a supported ELS stream for patched OpenSSL and other base packages

Test plan

• Comment /ok-to-test on Konflux hypershift-release-mce-28-on-pull-request
• Verify operator image build succeeds on release-4.18
• Attach resulting image digest to ACM-37663 for PSIRT validation

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[openshift-merge-bot]

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[openshift-ci-robot]

@yiraeChristineKim: This pull request references ACM-37663 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 vulnerability to target either version "4.18.z." or "openshift-4.18.z.", but it targets "MCE 2.8.0" instead.

Details

In response to this:

Jira: ACM-37663

Summary

• Rebase Containerfile.operator runtime stage from rhel9-4-els/rhel:9.4 to rhel9-8-els/rhel:9.8
• The 9.4 ELS base is no longer supported/receiving updates; MCE 2.8 operator builds need a supported ELS stream for patched OpenSSL and other base packages

Test plan

• Comment /ok-to-test on Konflux hypershift-release-mce-28-on-pull-request
• Verify operator image build succeeds on release-4.18
• Attach resulting image digest to ACM-37663 for PSIRT validation

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[openshift-ci]

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[yiraeChristineKim]

/ok-to-test

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: yiraeChristineKim

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[openshift-ci]

@yiraeChristineKim: The following tests 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-aws	73deac0	link	true	/test e2e-aws
ci/prow/e2e-kubevirt-aws-ovn-reduced	73deac0	link	true	/test e2e-kubevirt-aws-ovn-reduced

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