title: Specify SSH credentials/keys in Windows Git under Jenkins user
body: <p>I am using Jenkins in our builds
  So I am already using the GIT Plugin
  This plugin lets me specify Jenkins credentials, where we have already specified and installed/setup SSH keys.</p>
  
  <p>However at the end of the build, I'd like to git tag my repo. I am calling the git.exe command line, and I get this error on a push:</p>
  
  <pre><code>Permission denied (publickey).
  fatal: Could not read from remote repository.
  </code></pre>
  
  <p>Ideally, we don't want to use another plug in, (e.g. Git Publisher), as we are trying to do more of this via our own scripts as there is a good possibility that we may not use Jenkins in the future.</p>
  
  <p>Also, ideally, we don't want to install items on our build server if we don't have to.</p>
  
  <p>So the question is - how can I specify ssh keys/credentials on the command line for the given 'session'?</p>
  
  <p>Thank you.</p>