[NOTICKET] ci: refactor ci to create a release on harbor on new repo tags

This MR adds the capability to the CI to upload the charts to CERN helm registry (Harbor).

For that I have added a new step named helm_deploy that when a tag is made within the repo:

• fist, checks if the tag name exists in harbor; and,
• second, upload the chart to harbor tagged with the same name as the tag in the repo.

Once uploaded the helm chart can be downloaded for example as follows: helm pull oci://registry.cern.ch/monit/cern-it-kubernetes-monitoring --version 0.2.0