Support RTD.

[trivialfis]

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[Copilot]

Pull request overview

This PR adds support for Read the Docs (RTD) by introducing a CUDA configuration option that allows building pyhwloc without CUDA dependencies in minimal environments like RTD. The key changes enable the documentation to be built automatically on RTD with appropriate configuration.

• Added PYHWLOC_WITH_CUDA option to conditionally build CUDA-related components
• Centralized hwloc version management in dev/hwloc_version file
• Configured RTD build environment with necessary dependencies and conda setup

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
hatch/hook.py	Added CUDA_KEY environment variable and logic to disable CUDA in CMake when needed
hatch/backend.py	Added CUDA configuration handling in build_config context manager
CMakeLists.txt	Made CUDA components conditional based on PYHWLOC_WITH_CUDA option and centralized version reading
docs/source/conf.py	Added RTD detection and automated hwloc XML documentation generation
docs/source/build.rst	Documented the new with-cuda configuration setting
docs/source/dev.rst	Added instructions for updating hwloc version
dev/hwloc_version	Created centralized file for storing hwloc commit hash
dev/Dockerfile.cpu	Updated to use centralized hwloc version file
.readthedocs.yaml	Configured RTD build with required apt packages and conda environment
.github/workflows/main.yml	Updated workflow to use centralized hwloc version file

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