Add timezone to docker compose and fix group id.

Author: devosc

docker-compose.yml

@@ -13,7 +13,8 @@ services:
         - NODE_JS=true
         - RELEASE_VERSION=apache
         - USER_ID=${USER_ID}
-        - GROUP_ID=${USER_ID}
+        - GROUP_ID=${GROUP_ID}
+        - TZ=${TZ}
       context: ~/docker
     container_name: mvc5playground
     labels: