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Morgan
ea269d2761
The arm64 build cross-compiled with the Rust target triple inside an amd64 container and copied the binary out, deliberately avoiding Docker emulation because arm64 emulation is unreliable on some BuildKit instances. A dedicated Ubuntu VM on an M4 Mac Mini is now available under the ubuntu-arm64 label. Each matrix entry carries its own runner label and a native flag, so builds can be moved between runners or between build modes without changing the workflow structure. Where native is set, the build-native action compiles on the host and assembles the artefact tree, leaving Docker to package it. It builds into a target directory outside the per-run workspace so cargo can reuse artefacts between runs. The Dockerfile's ARTIFACTS argument selects whether artefacts come from the builder stage or from out/ in the build context; prepper and the final image are unchanged. Libraries are resolved where the binary was linked, so arm64 images carry Ubuntu's rather than Debian's. Architecture flags are split into TARGET_MARCH, which feeds -march for the C and C++ compilers, and TARGET_RUSTFLAGS, which is appended to RUSTFLAGS. amd64 passes haswell to both as before; arm64 passes +crc, which rustc does not enable by default. TARGET_CPU still drives the tag and artefact suffix.