title: Allow other users to execute google spreadsheet scripts
body: <p>I have made a simple Google Spreadsheet with some scripting behind to update colours depending on status, set update and creation dates for rows and a few other controls.</p>
  
  <p>It all works when I am editing it with my own user, but now that set spreadsheet is set to public (access via link), anyone else accessing the spreadsheet gets an error <code>you do not have permissions to do this action</code>.</p>
  
  <p>I am using <code>onEdit()</code> triggers and apparently guest users do not have permission to execute them. Do I have to configure something in order for it to work?</p>
  
  <p>thanks</p>