title: How to prevent team city from cleaning up nuget artifacts
body: <p>We're using team city as a nuget server and the artifact cleaning is removing old nuget packages. Unfortunately some of our packages aren't built that often, and when they get cleaned up other builds break.</p>
  
  <p>I've tried changing the clean up rules to exclude <code>*.nupkg</code>, but this doesn't seem to be working. </p>
  
  <p>Any ideas?</p>