There is an updated pull request by hazen2215 against master on the void-packages repository

https://github.com/hazen2215/void-packages XBPS_GOPROXY
https://github.com/void-linux/void-packages/pull/43668

[RFC] optionally set GOPROXY, GOSUMDB when building go packages
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This will allow xbps-src to set environment variable `GOPROXY` and `GOSUMDB` when building go packages.
When `GOPROXY` is set to `direct`, it pulls modules from source repositories like github and `git` needs to be in `hostmakedepends`.

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A patch file from https://github.com/void-linux/void-packages/pull/43668.patch is attached