Add codeowners to script repo

[EthanPERRUZZA]

Making a change in a script, I realized I was able to merge my changes without any review.

I would say that scripts are under the responsibility of the devops team, hence this PR.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.06%. Comparing base (f0ab6fa) to head (403c7d2).
Report is 20 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9438      +/-   ##
============================================
- Coverage     39.08%   39.06%   -0.03%     
  Complexity     2270     2270              
============================================
  Files          1308     1308              
  Lines         99220    99317      +97     
  Branches       3315     3316       +1     
============================================
+ Hits          38785    38794       +9     
- Misses        58471    58558      +87     
- Partials       1964     1965       +1     

Flag	Coverage Δ
core	74.99% <ø> (+<0.01%)	⬆️
editoast	71.88% <ø> (-0.14%)	⬇️
front	10.32% <ø> (-0.01%)	⬇️
gateway	2.50% <ø> (ø)
osrdyne	3.29% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.71% <ø> (ø)

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[flomonster]

Thanks