ci: sccache S3 caching + parallel test jobs - #47
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Configure sccache with ECMWF S3-compatible object store for shared compilation caching across all CI jobs. Split the monolithic test job into four parallel jobs (Rust, Python 3.13, xarray+zarr, free-threaded) to reduce the Linux critical path. Add sccache stats reporting and cmake compiler launchers for C++ caching.
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Summary
testjob into 4 parallel jobs: Rust, Python 3.13, xarray+zarr, free-threaded 3.13tExpected impact
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https://sites.ecmwf.int/docs/tensogram/pull-requests/PR-47