After using gh auth login and choosing HTTPS mode to authenticate git with GitHub, brew update prints this warning:

$ brew update
gh auth git-credential get: gh: command not found
fatal: could not read Username for 'https://github.com': terminal prompts disabled

This is because gh sets this up in the global gitconfig:

[credential "https://github.com"]
	helper = !gh auth git-credential

The gh binary is to be found in /usr/local/bin/gh when installed with Homebrew. However, when running brew commands, the PATH does not include /usr/local/bin.

A potential solution would be to reference gh by its full path from git credential configuration.

Ref. #2449