add flags for easier plugin development

just a suggestion; but this repo is great for standing up a simple stack with docker-compose and using as a basis for local plugin dev; these settings are needed in order to enable plugin registration.

Admittedly these are not the standard secure signed plugin only setups, but my thought process here is that as a tutorial stack it makes sense.

Author: moxious

docker-compose.yml

@@ -40,6 +40,9 @@ services:
       - 3000:3000
     networks:
       - grafana
+    environment:
+      - "GF_DEFAULT_APP_MODE=development"
+      - "GT_LOG_LEVEL=debug"
 
   app:
     build: ./app