fix(ci): fix helm push command to use only namespace

[verbotenj]

What this PR does / why we need it

Fixes pushing helm chart to Docker hub.

Push the chart to a Docker Hub repository.
 helm push demo-0.1.0.tgz oci://registry-1.docker.io/docker
This uploads the Helm chart tarball to a demo repository in the docker namespace.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer

Checklist

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• DCO signed
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