add release 1.12 jobs for s390x

[dilipgb]

This PR updates the s390x-related prow jobs for release 1.12.

[dilipgb]

@cardil can you please take a look at the PR. I have updated schedule for s390x jobs for release 1.12.

[dilipgb]

@upodroid @psschwei can you please take a look at this PR? This PR update prow jobs for s390x arch.

[upodroid]

LGTM

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dilipgb, upodroid

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[knative-prow]

@dilipgb: Updated the job-config configmap in namespace default at cluster default using the following files:

• key eventing-kafka-broker-release-1.12.gen.yaml using file prow/jobs/generated/knative-extensions/eventing-kafka-broker-release-1.12.gen.yaml
• key eventing-kafka-release-1.12.gen.yaml using file prow/jobs/generated/knative-extensions/eventing-kafka-release-1.12.gen.yaml
• key kn-plugin-event-release-1.12.gen.yaml using file prow/jobs/generated/knative-extensions/kn-plugin-event-release-1.12.gen.yaml
• key client-release-1.12.gen.yaml using file prow/jobs/generated/knative/client-release-1.12.gen.yaml
• key eventing-release-1.12.gen.yaml using file prow/jobs/generated/knative/eventing-release-1.12.gen.yaml
• key operator-release-1.12.gen.yaml using file prow/jobs/generated/knative/operator-release-1.12.gen.yaml
• key serving-release-1.12.gen.yaml using file prow/jobs/generated/knative/serving-release-1.12.gen.yaml

In response to this:

This PR updates the s390x-related prow jobs for release 1.12.

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