[faiproject/fai] 68b150: add .gitignore

[Mrfai]

  Branch: refs/heads/master
  Home:   https://github.com/faiproject/fai
  Commit: 68b150ee85f31397b38a7267ddaa01b87fbd1aa3
      https://github.com/faiproject/fai/commit/68b150ee85f31397b38a7267ddaa01b87fbd1aa3
  Author: Thomas Lange <lange at debian.org>
  Date:   2023-05-25 (Thu, 25 May 2023)

  Changed paths:
    A .gitignore

  Log Message:
  -----------
  add .gitignore