Fix hardcoded container name for nic jobs

[dareste]

Proposed changes

Fixes #66.

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[mrajagopal]

In all this, we are assuming that the nginx-ingress pod is called so or contains that string in its name.
So far we have not seen otherwise.
Therefore, assuming so shall suffice for now.
When we encounter a case where the nginx-ingress pod doesn't have it in the name, then we may need to pass argument for the pod name.