Reduce boltdb index period to 24h

168h produced the following error:

    invalid schema config: boltdb-shipper works best with 24h periodic index config.
    Either add a new config with future date set to 24h to retain the existing index or
    change the existing config to use 24h period.

ansible/roles/apps/templates/settings/loki-stack.yaml

@@ -28,7 +28,7 @@ loki:
         schema: v11
         index:
           prefix: index_
-          period: 168h  # 7 days
+          period: 24h
     storage_config:
       boltdb_shipper:
         active_index_directory: /tmp/loki/boltdb-shipper-active