title: manage 2 git users gpg key and choose gpg sign per user
body: <p>I have 1 github user and another gitlab user, and I have created 1 gpg key for each because my email address differs. </p>
  
  <p>The problem is I have to execute <code>git config --global user.signingkey</code> everytime I want to commit to different git repos.</p>
  
  <p>Is there a way I can manage my gpg keys per git user?</p>