create/src/Mod/Fem/femtest/failing_tests.md

• the following tests fail on ci, TODO somehow fix, even if they pass on my local machine:

make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_constraint_centrif make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_constraint_contact_solid_solid make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_z88.TestSolverZ88.test_ccx_cantilever_ele_tria6