gengo: use make directive for verify job

[MadhavJivrajani]

To bring this into effect: kubernetes/gengo#267

/assign @dims
/hold
till kubernetes/gengo#267 is merged.

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, MadhavJivrajani

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[MadhavJivrajani]

/hold cancel

[k8s-ci-robot]

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

• key gengo-config.yaml using file config/jobs/kubernetes/gengo/gengo-config.yaml

In response to this:

To bring this into effect: kubernetes/gengo#267

/assign @dims
/hold
till kubernetes/gengo#267 is merged.

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