Add methods to test the toolchain
The 23b toolchain right now dosent install libxc
even though its in the environment definition.
See spack-environments#40 (closed)
It would have gone unnoticed that this package was not installed. It makes sense to have a test
command that tests that the installed toolchain meets certain expectations for eg:
- selected few packages are present as expected
- Lmod modules are loadable ( including the order of packages etc )
- compile a small tet program?
- etc