How to configure git to use a proxy inside guix build container

[Jorge]

Hi. guix pull fails:
Updating from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
guix pull: error: Git error: failed to connect to git.savannah.gnu.org: 
Connection timed out

I suspect git inside the guix build container tries to connect directly
to the Internet instead of using the proxy. Outside guix I can
successfully run ~git clone https://git.savannah.gnu.org/git/guix.git~

So how do I configure a proxy for git inside guix?

Regards

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