Use k8s-infra-prow-build-trusted for an image-pushing job

[spiffxp]

I picked an image that wg-k8s-infra owns to prove that
this works

[BenTheElder]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, spiffxp

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• config/jobs/image-pushing/OWNERS [BenTheElder]

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[k8s-ci-robot]

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

• key k8s-staging-infra-tools.yaml using file config/jobs/image-pushing/k8s-staging-infra-tools.yaml

In response to this:

I picked an image that wg-k8s-infra owns to prove that
this works

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