Use Geant4 transport on macosx

With newer version of macosx and/or XCode the Geant3 code compiles without problems but when it comes to memory allocation during runtime the execution crashes. Up to now the underlying problem couldn't be identified. Change CI tests such that on macosx only Geant4 is used. On Linux still Geant3 is used as simulation engine.

added Testing label

requested review from @p.-a.loizeau

assigned to @p.-a.loizeau

added 1 commit

• 591d99fa - Apply clang-format

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Dear @f.uhlig, @p.-a.loizeau, @v.singhal, @c.muentz, @m.deveaux, @j.stroth,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

approved this merge request

merged