Try using configmaps for Rails environment variables

[Mr0grog]

With the addition of #29, we have three config files in each environment with mostly the same very large set of environment values. We should probably use a ConfigMap object to share those values.

Docs:

• https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/
• https://kubernetes.io/blog/2016/04/configuration-management-with-containers/

And a nice, extra-clear example: https://gist.github.com/troyharvey/4506472732157221e04c6b15e3b3f094

[Mr0grog]

The biggest open question here is whether we can layer env over envFrom. I think we can, but need to test. The alternative is to have another ConfigMap, I guess, since we can layer them inside envFrom.

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