Add Linux ARM64 (aarch64-linux-gnu) release binary

[aaajiao]

Request

The CI release workflow currently builds binaries for:

• Linux x86_64
• macOS Intel (x86_64)
• macOS Apple Silicon (aarch64)
• Windows x86_64

Would love to see Linux ARM64 (aarch64-unknown-linux-gnu) added to the release matrix.

Use case

Running on OrbStack (Linux ARM64 VM on Apple Silicon Mac), which is becoming a common dev/server setup. Also relevant for Raspberry Pi, AWS Graviton, and other ARM64 Linux environments.

Workaround

Currently compiling from source with a local Rust toolchain, but a pre-built binary would lower the barrier significantly.

Thanks for the Rust rewrite — the project looks great.