When building on Mac with Apple Silicon the arm64 version of rust-musl-cross is not available:
% make
docker run --rm -it -v ~/.cargo/registry:/root/.cargo/registry -v "/Users/k0gen/Dev/hello-world-wrapper"/hello-world:/home/rust/src start9/rust-musl-cross:aarch64-musl cargo +beta build --release
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested