sccache on windows does not seem to work correctly

[DiamonDinoia]

Dear team,

in my test pipelines I consistently see that linux/mac jobs have a 100% hit rate (I re-run the pipeline twice), but windows achieves 0%. Moreover, I compile the same code twice (with same flags, one standalone one through pip) so cache hit rate should be at least 50% but I still get 0%.

Am I doing anything wrong?

Windows job: https://github.com/DiamonDinoia/finufft/actions/runs/13046204138#summary-36416882287
Linux job: https://github.com/DiamonDinoia/finufft/actions/runs/13046204138#summary-36416852880
yaml: https://github.com/DiamonDinoia/finufft/blob/sccache-windows-fix/.github/workflows/cmake_ci.yml
full run: https://github.com/DiamonDinoia/finufft/actions/runs/13046204138