Fix database URI under docker-compose

* Make the web service connect to the mongo service, not mLab
* Update readme to remove the "change config" step
* Import NODE_ENV into the web service so the appropriate config is used

README.md

@@ -80,10 +80,6 @@ npm run dev
 
 The repo includes the Dockerfile and docker-compose.yml necessary to setup the app and the db instance then connect them together.
 
-* Change the db config in `config/env/development.js` to point to the respective Docker container.
-```
-db: "mongodb://mongo:27017/nodegoat",
-```
 * Build the images:
 ```
 docker-compose build

docker-compose.yml

@@ -3,6 +3,9 @@ version: "3.7"
 services:
   web:
     build: .
+    environment:
+      NODE_ENV:
+      MONGODB_URI: mongodb://mongo:27017/nodegoat
     command: sh -c "until nc -z -w 2 mongo 27017 && echo 'mongo is ready for connections' && node artifacts/db-reset.js && npm start; do sleep 2; done"
     ports:
       - "4000:4000"