Go seems to have lost track of gitconfig

[AJP]

Prior to some updates, Go modules were downloading perfectly fine via SSH when running hugo serve.

This was enabled by adding entries like the following to ~/.gitconfig

[url "git@github.com:user-name"]
  insteadOf = https://github.com/user-name

I now get this error:

go mod download: ... exit status 128:
	fatal: could not read Username for 'https://github.com': terminal prompts disabled
Confirm the import path was entered correctly.
If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.

I have confirmed that the SSH key is configured correctly, as I am able to clone the repos for the modules in question, via SSH.

My .gitconfig file has not changed.

Also, the same error occurs if I add tat config to .git/config within the repo.

hugo v0.92.2+extended and go version go1.17.1 on Linux.

Is there a way to double-check if go is finding .gitconfig?

[AJP]

Ok as per this post Hugo mod failing in v0.91.1 but works in v0.91.0 - #4 by techmagus, if I run export HUGO_SECURITY_EXEC_OSENV=".*" and then hugo serve it works. From then on it works in any other terminals without HUGO_SECURITY_EXEC_OSENV.