Fix github workflow to use Containerfile

[rabi]

We changed the file but did not update the workflow.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fao89, rabi, slagle

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[slagle]

/retest

[openshift-ci]

New changes are detected. LGTM label has been removed.

[rabi]

/override rdoproject.org/github-check

[openshift-ci]

@rabi: Overrode contexts on behalf of rabi: rdoproject.org/github-check

In response to this:

/override rdoproject.org/github-check

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