Switch to reusable action

[tmi]

Switches to reusable action, to have releases for all python versions and platforms

There are two caveats here:

• this is realistically useful only after https://github.com/ecmwf/metkit/pull/55/files gets merged
• the name of the resulting wheel is fdblib. That doesn't play well with findlibs.find("fdb5") (which is currently used in pyfdb), and instead findlibs.find("fdb5", "fdblib") is required. Or, we can instead name the wheel fdb5lib -- whatever you guys find suitable

[FussyDuck]

All committers have signed the CLA.

[Ozaq]

Id prefer if the name would match the wrapped .so, i.e. libfdb5 and ofc this makes most sense if this is applied to every wrapper python module. Just my 2 cents :)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.51%. Comparing base (4f636dd) to head (cdae28e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #78   +/-   ##
========================================
  Coverage    61.51%   61.51%           
========================================
  Files          275      275           
  Lines        15245    15245           
  Branches      1556     1556           
========================================
  Hits          9378     9378           
  Misses        5867     5867           

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