py-triton: add main

[aurianer]

• add main branch
• use triton environment variables for clang

[spackbot-app]

Hi @aurianer! I noticed that the following package(s) don't yet have maintainers:

• py-triton

Are you interested in adopting any of these package(s)? If so, simply add the following to the package class:

    maintainers("aurianer")

If not, could you contact the developers of this package and see if they are interested? You can quickly see who has worked on a package with spack blame:

$ spack blame py-triton

Thank you for your help! Please don't add maintainers without their consent.

You don't have to be a Spack expert or package developer in order to be a "maintainer," it just gives us a list of users willing to review PRs or debug issues relating to this package. A package can have multiple maintainers; just add a list of GitHub handles of anyone who wants to volunteer.

[tldahlgren]

Confirmed the branch.

[tldahlgren]

@adamjstewart Do you want to comment on this PR since you contributed it 3 months ago?

[alecbcs]

Looks good to me. Thanks @aurianer!