title: setup trigger for file change in teamcity
body: <p>I can setup teamcity trigger to run tests whenever there in VCS checkin/ change.</p>
  
  <p>Then I setup <code>command line</code> build steps to access files on system .</p>
  
  <p>e.g. `custom script' </p>
  
  <pre><code>cd ~/Desktop
  ls
  </code></pre>
  
  <p>But is there way to trigger test run if there is change in file e.g. <code>test.txt</code></p>
  
  <p>I want to setup trigger as 'if file changes run tests'.</p>
  
  <p>Or it has to be git checkin?</p>