ci: scope UV_PRERELEASE to Python 3.15 in unittest workflow - #18529
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Remove global UV_PRERELEASE: allow from top-level workflow env and scope it strictly to Python 3.15 unit tests until Python 3.15 is officially released with stable upstream binary wheels. Fixes #18532
daniel-sanche
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Sep 30, 2026
Enable UV_PRERELEASE=allow via a conditional step only on Python 3.15 matrix shards to avoid pulling prerelease versions on stable Python versions while preventing empty string UV_PRERELEASE export errors. Fixes #18532
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Context & Problem
A top-level
UV_PRERELEASE: "allow"was previously set on.github/workflows/unittest.ymlto support Python 3.15. However, because it was set at the top-level workflow environment,uvresolved prerelease packages (such aspandas 3.1.0rc0) across all Python 3.10-3.14 unit test runs, causing unintentional test breakage on stable Python shards.