Add env to knative/hack unit tests

[upodroid]

/cc @kvmware @cardil

This PR should fix the unbound variable error breaking the units tests in knative/hack#230

I also ran shfmt on the run_job.sh script.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[krsna-m]

/lgtm

[knative-prow]

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

• key hack-main.gen.yaml using file prow/jobs/generated/knative/hack-main.gen.yaml

In response to this:

/cc @kvmware @cardil

This PR should fix the unbound variable error breaking the units tests in knative/hack#230

I also ran shfmt on the run_job.sh script.

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