title: automatically execute system command when saving all files
body: <p>I am trying to figure out how to get VS Code to automatically execute system commands when I save all files. And, if possible, pass the path to the root/main folder to the command. For example, say I have <code>C:\users\nacho\path\to\some\folder</code> opened and it has numerous files and sub-folders with their own files.</p>
  
  <p>No matter what file I'm currently/actively editing, when/if I save-all files I want to run the system command <code>someCommand "C:\users\nacho\path\to\some\folder"</code>.</p>
  
  <p>Is this possible? I saw the build tasks but that requires me to run the build command. I want it to trigger automatically anytime I save all files.</p>