Is there any way to set the go runtime env $GORPOXY?

[countree103103]

I had trouble deploying my go runtime function.
The deploying stage showed that my network couldn't reach origin https://proxy.golang.org, so I have to set my own $GOPROXY.
I searched in Bing AI, it said that I can edit the "func.yaml" file to make it happen. But I found nothing in the document.
Is there any way to set the go runtime env $GORPOXY? ( It seems like I have to deal with the Dockerfile? )