`jointfit_novat2k` recipe

[vhewes]

write a spack recipe for the nova-t2k joint fit repository

[chenel]

@ArturSztuc reports that he has already had success updating the container to AlmaLinux 8.9. (See: novaexperiment/nova-sl7-novat2k@8f40551).

Maybe we should consider either renaming the repository or making a new one, since it will no longer be sl7...