[INFRA] update github action

[Remi-Gau]

• switch to github action to check markdown linting

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release_candidate_1.2@59aa522). Click here to learn what that means.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##             release_candidate_1.2     #150   +/-   ##
========================================================
  Coverage                         ?   21.88%           
========================================================
  Files                            ?       54           
  Lines                            ?      786           
  Branches                         ?        0           
========================================================
  Hits                             ?      172           
  Misses                           ?      614           
  Partials                         ?        0           

Flag	Coverage Δ
unittests	21.88% <0.00%> (?)

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