etcdadm: create job to push builds to staging

[justinsb]

Following the usual pattern.

[justinsb]

cc @dlipovetsky

[spiffxp]

/test pull-test-infra-integration
#20498 (comment)

[spiffxp]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-ci-robot]

@justinsb: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

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

In response to this:

Following the usual pattern.

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