Enable to deploy metallb chart from OCI in RKE2 cluster manifests

Francois Eleouetrequested to merge
oci-helm-artifact into main

In order to deploy from oci, url has to be provided in chart parameter in helm.cattle.io HelmChart, and repo has to be omitted in that case:

The helm.cattle.io controller is actually issuing a helm install command in a pod (see here for details), and following command works:

helm install metallb oci://docker-proxy-asis-gitlab.repos.tech.orange/sylva-projects/sylva-core/metallb

But not with a repo:

helm install metallb oci://docker-proxy-asis-gitlab.repos.tech.orange/sylva-projects/sylva-core/metallb --repo https://metallb.github.io/metallb/

For that reason, we have to add some logic in manifests to prevent repo from being set when oci is used.

fixes: #236 (closed)

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