Add loki persistence

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

@@ -10,6 +10,13 @@ loki:
     requests:
       cpu: 200m
       memory: 90Mi
+  persistence:
+    enabled: true
+    accessModes:
+    - ReadWriteOnce
+    size: 10Gi
+    annotations: {}
+    # existingClaim:
   config:
     # https://github.com/grafana/loki/blob/main/cmd/loki/loki-local-config.yaml
     # https://grafana.com/docs/loki/latest/operations/storage/retention