Update Dockerfile and gitlab-ci

Closes https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/937

Part of https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/938

chart/drupal-operations/templates/database-restore.yaml

@@ -16,7 +16,7 @@ spec:
       description: The namespace of the drupal site
   steps:
     - name: database-restore
-      image: gitlab-registry.cern.ch/drupal/paas/drupal-operations/openshift-cli:velero-restore
+      image: {{ .Values.image }}
       imagePullPolicy: Always
       command:
         - /bin/sh