feat(cli-service): add envs dir config

[jtommy]

#2506

[LinusBorg]

This change means that env cars are no longer accessible in the vue.config.js file directly, since you load it before the vars are loaded.

Would have to be considered a breaking change imho

[jtommy]

@LinusBorg Yes, I said to you in the issue link I had to change the location where envs are loaded.
To be honest I didn't find another config file, except vue.config.js, where to add this option.

[LinusBorg]

To be honest I didn't find another config file, except vue.config.js, where to add this option.

Well, vue.config.js would be the right place in theory, and there's not other config file to use.

But since this change would mean you can't access process.en.VUE_APP_WHATEVER from your vue.config file anymore (except in functions like chainWebpack which are executed later), this would constitute a breaking change and we can't add it until we do 4.0, strictly speaking.

We can use #2506 to discuss other strategies, but right now I don't have any in mind.