openshift/images repository lacks a CI job to run unit tests

Description of problem

The egress-router implementations under https://github.com/openshift/images/tree/master/egress have unit tests alongside the implementations, within the same repository, but the repository does not have a CI job to run those unit tests. We do not have any tests for egress-router in https://github.com/openshift/origin. This means that we are effectively lacking CI test coverage for egress-router.

Version-Release number of selected component (if applicable)

All versions.

How reproducible

100%.

Steps to Reproduce

1. Open a PR in https://github.com/openshift/images and check which CI jobs are run on it.
2. Check the job definitions in https://github.com/openshift/release/blob/master/ci-operator/jobs/openshift/images/openshift-images-master-presubmits.yaml.

Actual results

There are "ci/prow/e2e-aws", "ci/prow/e2e-aws-upgrade", and "ci/prow/images" jobs defined, but no "ci/prow/unit" job.

Expected results

There should be a "ci/prow/unit" job, and this job should run the unit tests that are defined in the repository.

Additional info

The lack of a CI job came up on https://github.com/openshift/images/pull/162.