added missing volume for colosseum mysql and fix for collation issue

docker-compose.yml

@@ -9,7 +9,9 @@ services:
       - MYSQL_DATABASE=${DATABASE_DB}
       - MYSQL_USER=${DATABASE_USER}
       - MYSQL_PASSWORD=${DATABASE_PASSWORD}
-    command: mysqld --character-set-server=utf8  
+    command: mysqld --character-set-server=utf8  --collation-server=utf8_general_ci
+    volumes:
+      - /var/lib/cloudiator/colosseum-store/:/var/lib/mysql
   colosseum-service:
     depends_on:
       - "colosseum-store"