[chore] Enable ccache in builds

[mdboom]

This enables ccache on our non-Windows builds. This should make builds significantly faster.

(I'm going to run CI twice here to confirm it works as advertised.)

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[mdboom]

/ok to test

[cpcloud]

Any reason not to use https://github.com/mozilla/sccache (and https://github.com/mozilla/sccache-action) which seems to support windows?

[mdboom]

/ok to test

[mdboom]

Any reason not to use https://github.com/mozilla/sccache (and https://github.com/mozilla/sccache-action) which seems to support windows?

Nah, I just wasn't aware of it. It used to require a server component, but it looks like it defaults to local storage. I'll file an alternative PR for that and we can compare.

[mdboom]

Also, it looks like the workflow is getting stuck here. I wonder if it's because this PR modifies a workflow and there is an additional approval required for the bot (or something)?

[leofang]

This action is not yet approved by our admin, need to reach out to them first:
https://github.com/NVIDIA/cuda-python/actions/runs/18597054102

[mdboom]

This action is not yet approved by our admin, need to reach out to them first: https://github.com/NVIDIA/cuda-python/actions/runs/18597054102

Thanks. That explains it. Let's not reach out just yet -- the alternative of using sccache that @cpcloud suggested seems to be already approved, and if it works, we might as well go with it: #1156

[mdboom]

/ok to test

[mdboom]

/ok to test