Fix pyo3 Linux wheel cache compatibility

[dfrankland]

Summary

• split the rust-cache key for the pyo3 Linux workflow by target so x86_64 and aarch64 do not share one target cache
• run x86_64 stub_gen inside the manylinux_2_28 container so cached Rust artifacts match the wheel build libc environment
• keep aarch64 stub generation on the host path used by the cross build

Testing

• git diff --check -- .github/actions/setup_rust_cargo/action.yaml .github/workflows/pyo3.yml
• local commit hook checks passed on modified files

[trunk-io]

😎 Merged directly without going through the merge queue, as the queue was empty and the PR was up to date with the target branch - details.

[trunk-staging-io]

     

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.01%. Comparing base (e2604f0) to head (a793b50).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1090      +/-   ##
==========================================
+ Coverage   81.75%   82.01%   +0.26%     
==========================================
  Files          69       69              
  Lines       14917    14917              
==========================================
+ Hits        12195    12234      +39     
+ Misses       2722     2683      -39     

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[trunk-io]

     

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