updates github action script; shortens routine/variable names to avoid compiler warnings

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 41.55844% with 45 lines in your changes missing coverage. Please review.

Project coverage is 49.58%. Comparing base (f019883) to head (fd59015).
Report is 23 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/specfem3D/couple_with_injection.f90	43.39%	30 Missing ⚠️
src/specfem3D/read_external_stf.f90	38.46%	8 Missing ⚠️
src/meshfem3D/earth_chunk.f90	0.00%	4 Missing ⚠️
src/specfem3D/get_force.f90	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1801      +/-   ##
==========================================
- Coverage   49.77%   49.58%   -0.20%     
==========================================
  Files         272      272              
  Lines       62889    63235     +346     
==========================================
+ Hits        31305    31353      +48     
- Misses      31584    31882     +298     

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[danielpeter]

well, one fixed but then there's another one popping up :( will merge and see the rest on another day...