updates SIEM configuration and routines; adds github action tests for ADIOS2 and full gravity w/ PETSc

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 127 lines in your changes missing coverage. Please review.

Project coverage is 37.63%. Comparing base (8feb2c0) to head (2048cf5).
Report is 1 commits behind head on devel.

Files	Patch %	Lines
src/specfem3D/SIEM_solver_mpi.F90	0.00%	38 Missing ⚠️
src/specfem3D/SIEM_prepare_solver.F90	0.00%	33 Missing ⚠️
src/shared/SIEM_math_library.F90	0.00%	32 Missing ⚠️
src/gindex3D/create_gindex.f90	0.00%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #842      +/-   ##
==========================================
+ Coverage   37.27%   37.63%   +0.36%     
==========================================
  Files         278      278              
  Lines       64490    63871     -619     
==========================================
  Hits        24036    24036              
+ Misses      40454    39835     -619     

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