Simplify CI

[urschrei]

We no longer use cargo-all-features in geo, and rstar doesn't currently have any features, so this strategy needlessly inflates our test times.

Also bumps Docker images to test on Rust 1.83 and 1.84, retaining 1.63

• I agree to follow the project's code of conduct.
• I added an entry to rstar/CHANGELOG.md if knowledge of this change could be valuable to users.

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[urschrei]

I've also added caching to try to speed things up. Notably, the 1.63 job currently takes 6 minutes (vs around 1 minute for the 1.8x job), presumably due to the older index crates.io sync mechanism

[urschrei]

Ah, the workspace directive is causing the build to break because geo is using the old API which borrowed geometries (changed in #189).

I'll have to fix this on the geo side and build new images before we can merge this.

[urschrei]

A new error after rebasing onto #207: build failure on 1.63 due to rayon 1.11 but according to cargo tree rayon is only required by criterion, and that's v1.8.1 (rayon-core v1.12.1). It's not a default feature of geo-types, and we're not using the multithreading feature in rstar-benches.

What actually happened: I added the workspace switch to rstar-benches.

[urschrei]

Whatever about this PR, the crate currently won't build locally for me on master using its MSRV (repro: cargo +1.63 build) due to numerous packages requiring newer rustc. I'm confused as to how it's able to be built on our current 1.63 CI though (e.g. https://github.com/georust/rstar/actions/runs/17073341598/job/48407974736)

[adamreichold]

Whatever about this PR, the crate currently won't build locally for me on master using its MSRV (repro: cargo +1.63 build) due to numerous packages requiring newer rustc. I'm confused as to how it's able to be built on our current 1.63 CI though (e.g. https://github.com/georust/rstar/actions/runs/17073341598/job/48407974736)

defaults:
  run:
    working-directory: rstar

I think this is all due to --workspace, meaning we did not build test rstar-benches etc. on the MSRV before. Building only the library crate itself still works locally for me, but benchmarks and demo fails as you experience here.

I think we should just adjust the CI jobs accordingly: The Rust version matrix should only apply to the library crate itself (arguably even tests are out of scope for MSRV builds, but it is nice to have them working, e.g. for packaging in distros). The other checks like Rustfmt and Clippy should apply to the whole workspace.

[urschrei]

Seems sensible, and runs are all completing with the new setup.