Cache key conflict in CI between emscripten and another job

[SV-97]

Bug Description

I'm currently trying to set up CI for a project.
The project is structured as a cargo workspace with one native rust crate and one mixed python/rust project.
The mixed project is managed via uv (0.9.7) and maturin (1.9.3).

I generated a CI file using maturin generate-ci github --manifest-path palb_py/Cargo.toml --platform all and when running this as a github action I get the following error:

Error: Unable to reserve cache with key 3.1.46-linux-x64-master, another job may be creating this cache.

So there seems to be some issue around non-unique keys between the different jobs?

Here is the specific job that failed: https://github.com/SV-97/piecewise-affine-lower-bounding/actions/runs/20392397068/job/58603484057

Your maturin version (maturin --version)

1.9.3

Your Python version (python -V)

Python 3.12.11

Your pip version (pip -V)

pip 24.3.1

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

If on windows, have you checked that you aren't accidentally using unix path (those with the forward slash /)?

• Yes

Steps to Reproduce

1. Fork https://github.com/SV-97/piecewise-affine-lower-bounding/tree/ae334e7c9b1679582ab8af9f13290d1fb534526e
2. Try to run the GitHub Action
3. The emscripten job fails (also macos 13 since the runners have been retired; I'll open a separate issue for this)