[build] Signal explicitly to users the PyPI distribution is in alpha #20520
+25
−0
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By injecting a warning in the init.py file of the package before starting the build of the wheel.
This change is added to make the situation of the Python wheel distribution as clear as possible and to manage user expectations, in line with the discussions held during the ROOT Users Workshop 2025.
See some examples of questions and feedback already existing which could have benefited from a more clear description: #20472
https://root-forum.cern.ch/t/is-this-a-legitimate-release-of-root/64429