Add registry.redhat.io login to GH workflow

[lpiwowar]

The bundle generation step resolves image tags to digests, which requires pulling from registry.redhat.io (for the PostgreSQL image). Add authentication so the CI runner can access the Red Hat registry.

This PR resolves this GitHub workflow error we hit after merging the initial PR for the lcore migration.

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[umago]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lpiwowar, umago

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