improve config options for grapi (#269)

* make it possible to configure grapi through its cfg
* add test for config setting in grapi
* add volume for persistent data
* chown and add tests for dir

docker-compose.yml

@@ -227,9 +227,11 @@ services:
       - kopano_server
     volumes:
       - kopanosocket/:/run/kopano
+      - kopanograpi/:/var/lib/kopano-grapi
     environment:
       - SERVICE_TO_START=grapi
       - TZ=${TZ}
+      - KCCONF_GRAPI_ENABLE_EXPERIMENTAL_ENDPOINTS=false
     env_file:
       - kopano_grapi.env
     networks:
@@ -477,6 +479,7 @@ volumes:
   mtaconfig:
   mysql:
   kopanodata:
+  kopanograpi:
   kopanossl:
   kopanosocket:
   kopanowebapp: