This gist is intended as notes for myself, feel free to read them, but it's not here as a tutorial or steps to follow.
Instructions on how to configure git so that it changes the global user commit informations along with the GPG key depending on the parent directory in which the "used git repo" is. (Steps for Windows) This also works when using the Github Desktop App.
Locate .gitconfig file at %userprofile% and add the following config.
# Force usage of GPG key by default globally
[commit]
gpgSign = true