title: how do you create a folder and write to heroku's ephemeral storage?
body: <p>i'm using nodejs, and when my script uses fs.mkdir nothing seems to happen... it works well locally. is there an alternate command/function i can use to create and write to folders in heroku's file system?</p>
  <p>(yes i'm aware the ephemeral system is temporary, with my use case, all files will be deleted after 5 minutes)</p>