title: Git ignore SSH key and prompt for credential
body: <p>I would like to push code to a Github repository from a location that has been configured with a read-only deploy key.</p>
  
  <p>Currently, a <code>git push</code> results in:</p>
  
  <blockquote>
    <p>ERROR: The key you are authenticating with has been marked as read only.
    fatal: Could not read from remote repository.</p>
    
    <p>Please make sure you have the correct access rights</p>
  </blockquote>
  
  <p>Is there a way to trigger a one-time exception that prompts me to enter my credentials instead?</p>