chore: depend on cpython to ensure GIL-enabled Python - #1158
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CMake requires cpython on arm platforms to properly detect the Python interpreter. Add it to both linux and mac dev environments.
olemke
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Starting with Python 3.14, conda-forge ships the free-threaded (no-GIL) build as the default python package. CMake's
find_package(Python)does not recognize this freethreading variant by default, so an ARTS configuration against it fails or selects an interpreter our nanobind-based bindings cannot use. We require the traditional GIL-enabled interpreter.The clean fix would be to depend on the
python-gilpackage, which explicitly pins the GIL build; however, that package does not exist for Python versions below 3.14, so adding it would break environment creation on 3.12 and 3.13. Depending oncpythoninstead achieves the same effect. It pulls in the GIL-enabled CPython interpreter while remaining installable across all currently supported Python versions, making it a workaround that works universally rather than only on 3.14+.