Install grafana on its own server

Install grafana on its own server.

• in the admin vlan

• behind rp1

• bullseye

• Decide what to do with the swh-grafanalib-dashboards package to avoid manual installations (https://forge.softwareheritage.org/source/swh-grafana-dashboards/):

  • upgrade to bullseye ?
  • migrate to puppet ?

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Migrated from T3817 (view on Phabricator)