Updated code to support linux arm64 architecture

[lodenrogue]

This resolves #2 and adds support for arm64.

[gemini-code-assist]

Code Review

This pull request adds support for the linux-arm64 target, updating the build scripts, runtime embedding, distribution packaging, and platform update mechanisms. The feedback identifies two important issues: first, build_linux.sh must explicitly build both amd64 and arm64 runtimes because the compiler embeds both, and relying on the host's architecture will break the build; second, defaultProjectTarget() in src/project.go needs to handle macOS (darwin) explicitly to prevent generating a Linux target on macOS systems.

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[confh]

thanks for the PR.

i actually ended up refactoring how runtimes are handled in v0.2.7 to keep the compiler binary size down (it went from ~60MB to ~16MB). instead of embedding the runtimes, the compiler now pulls them directly from the github release page on demand and caches them in ~/.tiny/runtimes.

This also fixes the linux-arm64 support issue here.

[lodenrogue]

Nice. You took some of my code to solve the problem. Good luck with your project.