🐞 Bug report

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Is this a regression?

No

Description

Since 11.0.0 there is the new feature to inline fonts. The problem is that it does not work behind HTTP proxy. We have correctly set HTTP_PROXY/http_proxy and NO_PROXY/no_proxy environment variables, but it is ignored.

🔬 Minimal Reproduction

There is no support for proxy: https://github.com/angular/angular-cli/blob/871dd6a434fdd9674905bde307b5ad79d5d59603/packages/angular_devkit/build_angular/src/utils/index-file/inline-fonts.ts#L107

There is not really a reproduction scenario. It fails only when running behind HTTP proxy.

🔥 Exception or Error

✖ Index html generation failed.
Inlining of fonts failed. An error has occurred while retrieving https://fonts.googleapis.com/icon?family=Material+Icons over the internet.
connect ETIMEDOUT 172.217.16.202:443

🌍 Your Environment

Angular CLI: 11.0.1
Node: 14.15.0
OS: linux x64

Angular: 
... 
Ivy Workspace: 

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1100.1 (cli-only)
@angular-devkit/core         11.0.1 (cli-only)
@angular-devkit/schematics   11.0.1 (cli-only)
@schematics/angular          11.0.1 (cli-only)
@schematics/update           0.1100.1 (cli-only)

Anything else relevant?