chore(ruby): Resolve CI failure during aarch64-linux native build #591
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This PR fixes the build-native-binaries CI job, which failed when building for aarch64-linux because the host's x86_64 assembler was incorrectly used for ARM64 assembly.
This is fixed by:
GitHub Actions: Installing the gcc-aarch64-linux-gnu and binutils-aarch64-linux-gnu cross-compilation toolchain on the Ubuntu runner.
Rakefile: Explicitly setting the CC environment variable (e.g., to aarch64-linux-gnu-gcc) during the build, forcing cgo to use the correct cross-compiler for the ARM64 target.