feat(app): add Docker support

[Awk34]

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[Awk34]

@JeremyMarshall What do you think of this? I find this to be an incredibly simpler addition.

[JeremyMarshall]

@Awk34 Its good because there is no up stream dependencies but on the other hand there will need to be a full npm install depending on the cache

Docker will cache each individual step as it goes https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#build-cache and try to reuse it. So if you are rebuilding several apps with different dependencies then it will reinstall all the modules per build.

Also you can tell docker to ignore the cache or not cache intermediate steps too --no-cache=true --rm

[Awk34]

I'm seeing a rebuild time of .5s, which is pretty good

[JeremyMarshall]

@Awk34 Also, typically you would run Mongo in a separate container so its probably worth mentioning how to point to mongo with a `-e "MONGO_PORT_27017_TCP_ADDR=host:port" when running as you might not know where mongo is at build time https://docs.docker.com/engine/reference/run/#/env-environment-variables

[Awk34]

@JeremyMarshall yeah, there's still quite a bit of work to be done here. I'll probably me making a full tutorial about this. I have a project that I package into a Docker container on CircleCI and then push to a Kubernetes cluster on the Google Cloud Platform.

[Awk34]

Also with a very custom circle.yml config file, I've gotten my docker rebuilds in CircleCI down to about 2 seconds