add gromacs build with spectrum and cuda

envs/specific/m100/007_gnu_applications_spectrummpi/spack.yaml

 spack:
-
   definitions:
   - application_gromacs:
     - gromacs +cuda +mdrun_only ^spectrum-mpi
@@ -12,7 +11,7 @@ spack:
   - matrix:
     - [$all]
     - [$compilers]
-
+  - gromacs%gcc@8.4.0+cuda ^spectrum-mpi
   view: false
 #  concretization: together