Add python-nanonbind copr repo to build time repos

[kwk]

Merge only once this is green for the architectures that support MLIR: https://copr.fedorainfracloud.org/coprs/g/fedora-llvm-team/python-nanobind/build/9666166/

[Copilot]

Pull Request Overview

This PR adds the python-nanobind copr repository to the build-time repositories for LLVM snapshot builds. The change enables the build system to access the python-nanobind package during compilation, which is needed for MLIR support on compatible architectures.

• Adds "copr://@fedora-llvm-team/python-nanobind/" to the additional_copr_buildtime_repos list

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[tuliom]

I don't think this is needed right now because we are not building MLIR on branched Fedora.
AFAIU, we're waiting for opinions on the options we have.
Or what am I missing?

[kwk]

I don't think this is needed right now because we are not building MLIR on branched Fedora. AFAIU, we're waiting for opinions on the options we have. Or what am I missing?

What about people "depending" on snapshots for bleeding edge work? They most likely don't run rawhide and so they will never get MLIR, right?

[tuliom]

What about people "depending" on snapshots for bleeding edge work? They most likely don't run rawhide and so they will never get MLIR, right?

Indeed. But testing more scenarios increases our burden too.
So we need to find a tradeoff between spending too much time dealing with issues in unsupported environments and being able to reuse our builds plus getting information from different environments.

With that said, we may want to ask ourselves which parts of the LLVM projects we usually reuse from the daily snapshots.