CI: prevent xgboost build-script panic in Rust build & test workflow

[Copilot]

The Rust build & test GitHub Actions job failed during cargo build --features xgboost when xgboost_lib-sys panicked on a missing target/debug/deps path. This PR hardens the workflow by creating that path before the xgboost-enabled build step.

• Root cause addressed

  • xgboost_lib-sys build script canonicalizes target/debug/deps and panics if it is absent on a clean runner.

• Workflow change

  • Added an explicit directory creation step in .github/workflows/rust.yml immediately before the xgboost build step.

• Resulting execution order

  • Standard build
  • Ensure xgboost output dir exists
  • XGBoost-feature build

- name: Build
  run: cargo build --verbose

- name: Ensure xgboost output directory exists
  run: mkdir -p target/debug/deps

- name: Build with xgboost features
  run: cargo build --verbose --features xgboost

[singjc]

@copilot the GHA is still failing? https://github.com/singjc/redeem/actions/runs/34393258999/job/102646318068?pr=8

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[Copilot]

@copilot the GHA is still failing? https://github.com/singjc/redeem/actions/runs/34393258999/job/102646318068?pr=8

You’re right — it was still failing in the same xgboost build-script path. I pushed b3e3774, which switches CI to use the system XGBoost library (libxgboost-dev + XGBOOST_LIB_DIR=/usr/lib/x86_64-linux-gnu) so xgboost_lib-sys no longer hits the brittle prebuilt-download/canonicalize path.