A step-by-step walkthrough for cross-compiling static Rust binaries targeting Raspberry Pi (ARMv7 and ARMv6) inside Docker using musl for static linking. Covers setting up Rust targets with rustup, configuring the linker in .cargo/config, optimizing binary size via Cargo.toml release profile settings (opt-level z, LTO, single codegen unit), and building multi-architecture Docker images using Docker buildx with BUILDPLATFORM and TARGETPLATFORM arguments to dynamically select the correct Rust compilation target per architecture.
