kubevirt,s390x: Add presubmit for s390x e2e tests in kubevirt

[brianmcarey]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
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• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
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Release note:

[kubevirt-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[brianmcarey]

/rehearse

[kubevirt-bot]

Rehearsal jobs created for this PR:

rehearsal-pull-kubevirt-e2e-s390x

You can trigger rehearsal for all jobs by commenting either /rehearse or /rehearse all
on this PR.

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[brianmcarey]

/rehearse

[kubevirt-bot]

Rehearsal jobs created for this PR:

rehearsal-pull-kubevirt-e2e-s390x

You can trigger rehearsal for all jobs by commenting either /rehearse or /rehearse all
on this PR.

For a specific PR you can comment /rehearse {job-name}.

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[brianmcarey]

/rehearse

[kubevirt-bot]

Rehearsal jobs created for this PR:

rehearsal-pull-kubevirt-e2e-s390x

You can trigger rehearsal for all jobs by commenting either /rehearse or /rehearse all
on this PR.

For a specific PR you can comment /rehearse {job-name}.

For a list of jobs that you can rehearse you can comment /rehearse ?.

[brianmcarey]

@sourcery-ai review

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds a new presubmit job, pull-kubevirt-e2e-s390x, to run end-to-end tests on the s390x architecture. The job is configured to run on a dedicated s390x cluster with specific resource requests and environment variables.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added a new presubmit job for s390x e2e tests.	Configured the job to run on the prow-s390x-workloads cluster. Enabled decoration with a grace period of 5 minutes and a timeout of 4 hours. Set labels to disable bazel unnested and enable podman in container. Configured the job to use the quay.io/kubevirtci/bootstrap:v20250211-4e3c019 image. Set the target to k8s-1.31-wg-s390x. Set the KUBEVIRT_SLIM environment variable to true. Requested 21Gi of memory for the container. Enabled privileged security context for the container.	github/ci/prow-deploy/files/jobs/kubevirt/kubevirt/kubevirt-presubmits.yaml

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[sourcery-ai]

Hey @brianmcarey - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment explaining the purpose of the KUBEVIRTCI_TAG environment variable.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[kubevirt-bot]

@brianmcarey: 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
rehearsal-pull-kubevirt-e2e-s390x	001f441	link	unknown	/test pull-kubevirt-e2e-s390x

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[kubevirt-bot]

PR needs rebase.

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