feat(webpack): support env variables for index.html

[dzonatan]

It would be great to still have some kind of env variables or settings for index.html as we had previously with broccoli.
One of the use case would be setting <base href for different environments which I need now...

[filipesilva]

I don't think we ever supported adding custom variables to index.html, but there is a feature request for the base tag already in #1064.

[dzonatan]

You did.. At least I was able to use any env variable by {{environment.myVar}} interpolation.
So in my case it was <base href="{{environment.baseHref}}">.

Even originally the new project had some usages:

{{#unless environment.production}}
  <script src="/ember-cli-live-reload.js" type="text/javascript"></script>
{{/unless}}

So I think it's kinda breaking change after webpack merge.

Update:
Also baseURL in config/environment.js has no impact at all. I was trying to use it to make my dev server same as prod (to serve under some specific base href).

[filipesilva]

Huh, that must have been base functionality of ember-cli that we never really noticed. The best I can do now is to bump the priority of that base href feature, I'll try to work on it soon.

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