Dev 911:Update gingr's docker-compose.ci.yml to use !override (#24)

* update to use !override in docker-compose.ci.yml

* revert previous commit

* try !override again

* remove word volumes

* remove word volumes, keep !reset

* remove word volumes, update to !override

Author: yzhoubk

docker-compose.ci.yml

@@ -4,8 +4,7 @@ services:
   app:
     build: !reset
     image: ${DOCKER_APP_IMAGE}
-    volumes: !reset
-    volumes:
+    volumes: !override
       - artifacts:/opt/app/artifacts
 
   geoserver: !reset