GitHub Actions workflow that cross-compiles MAVS (MSU Autonomous Vehicle
Simulator — off-road terramechanics) on a native x86_64 Linux runner and uploads
the install tree as an artifact named mavs-install.
Why: MAVS cannot be built on Apple Silicon (embree NEON shim fails on aarch64; g++ segfaults under Rosetta). This CI produces the binary on real x86 hardware.
Fetch the artifact to ~/UGVPipeline with: ./docker/fetch_mavs_artifact.sh ptrken01/mavs-build