dockerize front end (#558)

* initial docker

* adds concurrency to be able to run yarn install

* adds 0.0.0.0 to allow docker access

* adds web service

* adds env variables

* updates root path

* adds volumes

* adds docker to readme

* adds score server client docker

* docker updates after convo

* speeds up build and removes env vars

* adds client as volume

* updates to docker setup

* checkpoint

* updates the docker file

* adds .env.* files

* replaces serve with http-server for cors

Co-authored-by: Jorge Escobar <jorge.e.escobar@omb.eop.gov>

client/gatsby-config.js

@@ -1,3 +1,7 @@
+require('dotenv').config({
+  path: `.env.${process.env.DATA_SOURCE}`,
+});
+
 module.exports = {
   siteMetadata: {
     title: 'Justice40',