Avoid config usage at build time

[ctjhoa]

As I understand Ember configuration files:

• ember-cli-build.js is for build time configuration
• config/environment is for run time configuration

My goal is to drive segment config at runtime to be able to reuse build artifact across multiple environments.

This first attempt use window variable to communicate the Ember config to the Segment snippet

[ctjhoa]

@josemarluedke reply from discord

I don't like the usage of the window.
I think we should go with injecting the script
Ember Metrics does something similar as well
https://github.com/adopted-ember-addons/ember-metrics/blob/master/addon/metrics-adapters/segment.js

[ctjhoa]

Note: Segment now offers analytics script as npm package.
https://github.com/segmentio/analytics-next#-using-as-an-npm-package