add group restriction

Golden_Repo/m/MATLAB/MATLAB-2023a-GCCcore-11.3.0.eb

@@ -45,8 +45,10 @@ postinstallcmds = [
     'chmod +x %(installdir)s/bin/matlab',
 ]
 
+group = "matlab"
+
 modloadmsg = """
-Attention: This is a RESTRICTED software available for ACADEMIC users only.
+Attention: This software is RESTRICTED to ACADEMIC users who are members of the group matlab\n.
 """
 
 modextravars = {