Log rotate configuration for grafana

Change-Id: I0effeb043ef6d034ff46b48c5366ea60e81f838c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/docker-compose.yaml b/installers/docker/docker-compose.yaml
index c8b846d..104de48 100644
--- a/installers/docker/docker-compose.yaml
+++ b/installers/docker/docker-compose.yaml
@@ -270,3 +270,9 @@
       - "${OSM_GRAFANA_PORTS:-3000:3000}"
     networks:
       - netOSM
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "100m"
+        max-file: "2"
+