Added docker volume to RO

Change-Id: I2896cf8218509e439732e5727bf9e51a1470ac09
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/docker-compose.yaml b/installers/docker/docker-compose.yaml
index 5342b30..b37e381 100644
--- a/installers/docker/docker-compose.yaml
+++ b/installers/docker/docker-compose.yaml
@@ -1,5 +1,6 @@
 version: '3'
 volumes:
+  ro:
   ro_db:
   mongo_db:
   mon_db:
@@ -130,6 +131,8 @@
       - ./ro.env
     #depends_on:
     #  - ro-db
+    volumes:
+      - ro:/var/log/osm
     ports:
       - "${OSM_RO_PORTS:-9090:9090}"
   mon: