docker: fix FromAsCasing warning in dockerfiles

[Synar]

Fix the warning generated by docker when from and as casing do not match in dockerfiles, see https://docs.docker.com/reference/build-checks/from-as-casing/

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.50%. Comparing base (a92037a) to head (bee9150).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9646      +/-   ##
============================================
- Coverage     42.51%   42.50%   -0.02%     
  Complexity     2272     2272              
============================================
  Files          1312     1312              
  Lines        105555   105563       +8     
  Branches       3304     3304              
============================================
- Hits          44879    44871       -8     
- Misses        58723    58739      +16     
  Partials       1953     1953              

Flag	Coverage Δ
core	75.05% <ø> (ø)
editoast	73.74% <ø> (-0.04%)	⬇️
front	18.79% <ø> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[Synar]

I will try and draft another pr soon to detect docker build --check warnings in the CI