title: git commit only timestamp modification of a file
body: <p>I have two files, <code>file1</code> and <code>file2</code>. I modified <code>file1</code> and didn't touch <code>file2</code>. After commit, CI started which checks modification dates of <code>file1</code> and <code>file2</code>. If <code>file2</code> is older, build tool generates its own version of <code>file2</code> from <code>file1</code> and compares the results (generated <code>file2</code> and <code>file2</code> which is in repo). If there is no match the error is generated.</p>
  
  <p>I don't want to modify <code>file2</code> and have no way to modify the build pipeline. The question is, how to commit only timestamp modification of <code>file2</code> so CI doesn't touch it? I want to make <code>file2</code> newer than <code>file1</code>.</p>
  
  <p>Please don't ask why CI is configured in such way. This is a big project with lot of contributors.</p>