Use workload identity to push prow and boskos

[fejta]

Switch from using a secret file to a service account

ref #15806

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fejta

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[fejta]

This appears to be passing tests now?

[Katharine]

/lgtm
/hold
feel free to unhold

[fejta]

/hold cancel

[k8s-ci-robot]

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

• key test-infra-trusted.yaml using file config/jobs/kubernetes/test-infra/test-infra-trusted.yaml

In response to this:

Switch from using a secret file to a service account

ref #15806

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[fejta]

Will it push? https://prow.k8s.io/view/gcs/kubernetes-jenkins/logs/post-test-infra-push-prow/1228041459496652801

[fejta]

Yes