add missing test dependencies to CI container
fluiddyn.calcul.test.test_easypyfft.TestFFTWGrid (test_fftw_grid_size)
fluiddyn/calcul/test/test_easypyfft.py:31: fftw_grid_size depends on the package pulp, which is not installed.
fluiddyn.calcul.test.test_sphericalharmo.TestSphericalHarmo (test_sht_random)
fluiddyn/calcul/test/test_sphericalharmo.py:20: SHTns not installed or can not be imported.