prototype of so-only wheel

[tmi]

This is a minimalistic prototype of building a trivial wheel with .so's only, to be used by subsequent wheels

It consists of:

• Dockerfile, dockerbuild.sh and buildscripts -- those should actually go to another repo (which one tho?), as these would be reused by all compiled projects.
  • the Dockerfile mainly just installs flex and bison and ecbuild, and copies the buildscripts
  • the buildscripts/{compile.sh, wheel-linux.sh, test-wheel.sh} invoke the respective parts of the wheel building -- see the github action for the sequencing
• the setup.cfg and buildconfig, which is the eckit-specific parts for the wheel building. This would presumably grow as we'd be wheelifying more complicated projects later (eg, build more components, more config options, more prereqs, ...)

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.73%. Comparing base (9d2807d) to head (3254484).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #152      +/-   ##
===========================================
- Coverage    63.74%   63.73%   -0.01%     
===========================================
  Files         1066     1066              
  Lines        55360    55360              
  Branches      4086     4086              
===========================================
- Hits         35289    35285       -4     
- Misses       20071    20075       +4     

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