Add missing var in the README

[bshewale]

As a pull request owner and reviewers, I checked that:

• Appropriate documentation exists and/or is up-to-date:
  • README in the role
  • Content of the docs/source is reflecting the changes

[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://review.rdoproject.org/zuul/buildset/fe0494562ead40a8a38eea0c5534f156

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 03m 17s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 21m 43s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 16m 07s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 39s
❌ cifmw-pod-pre-commit FAILURE in 7m 41s
❌ cifmw-molecule-update_containers FAILURE in 4m 45s

[viroel]

I agree with the changes, but the PR title and description needs update.
molecule job is also failing and will require some fixes too.

[raukadah]

Please check the comment in the role content change.

[frenzyfriday]

/lgtm

[pablintino]

/approve

[openshift-ci]

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