Allow Lava to be installed via Spack

[schmitts]

As a user I'd like to be able to install Lava using Spack, creating spack packages will allow users in the HPC space to install and use lava easily.

"Spack is a "flexible package manager that supports multiple versions, configurations, platforms, and compilers.", cf. https://spack.io.

Do you already have a Spack package available? If not, I'll volunteer to put it together."

[mgkwill]

Hi @schmitts Thanks for opening this issue.

A lava package for Spack sounds like a good idea, especially if you are volunteering. What does this entail outside of #132?

[schmitts]

A Spack package is easy if:

1. the dependencies are correctly specified and are really used as dependencies and not shipped as vendor versions (git submodule or plain copies etc.)
2. the dependencies already exist as Spack packages (but there are already many https://spack.readthedocs.io/en/latest/package_list.html)
3. the installation follows the standards

From what I've seen from Lava so far, I don't see a problem.

[Tobias-Fischer]

This might help you @schmitts: #119

[mgkwill]

@schmitts are you still willing to create a Spack package for Lava?

[schmitts]

@mgkwill Yes, sorry for the delay.

[schmitts]

I'm on it. Having some more questions concering the dependencies (cf. #132).