introducing export-ignore directive for all files to make github-generated tarballs emtpy

[slayoo]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.71%. Comparing base (ebee9df) to head (ddc8c61).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1774   +/-   ##
=======================================
  Coverage   42.71%   42.71%           
=======================================
  Files         361      361           
  Lines       97333    97333           
  Branches    19929    19929           
=======================================
  Hits        41577    41577           
  Misses      55756    55756           

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[GillesDuvert]

@slayoo you can merge I presume?

[slayoo]

thanks, let's try it!