Cron to enforce administrator role configuration

Follow up from #15 (comment 8065168)

Add a cronjob that runs everyday to re-add the drupal-supporters group, based on MR !26 (merged)

Cronjob can be added to okd4-install drupal chart (https://gitlab.cern.ch/paas-tools/okd4-install/-/tree/master/chart/charts/drupal/templates) in namespace openshift-cern-drupal