docker_compose.yml doesn't set MONGODB_URI

[rcowsill]

When deployed through docker-compose the default configuration makes the web service connect to mongodb://ds159217.mlab.com:59217/nodegoat. The deploy instructions for docker include a step to point the web service at the mongo service, but it's easy to forget that.

Also, as mentioned here, the CI configuration has been changed in branch feature/187 to use docker. The default database setting is used, so all three jobs in the build simultaneously connect to the mLab database and interfere with each other. Currently only one job can succeed at a time, and none will succeed after the mLab database gets shut down (see #212).

I think the MONGODB_URI should be set to mongodb://mongo:27017/nodegoat in the docker-compose.yml. That way the web service will always connect to the correct mongo instance when deployed through docker-compose.

[rcowsill]

Resolved by #215