title: Include .pem for git pull / push
body: <p>I keep a Git server on Amazon EC2, and in order to <code>push</code> or <code>pull</code> to it I need to run <code>ssh-add ~/.ssh/pem/Me.pem</code>. Is there any way to add this <code>.pem</code> file to the Git config such that I won't have to run <code>ssh-add</code> each time? I'm thinking of a configuration file in a similar vein to <code>~/.ssh/config</code> which lets users configure just such an option (<code>IdentityFile ~/.ssh/pem/Me.pem</code>).</p>