feat: Add Linux ARM64 (aarch64) release artifacts and .deb packages

[beingminimal]

Issue Description

Is your feature request related to a problem? Please describe.
Currently, pre-built binary releases and .deb installation packages are not provided for Linux ARM64 (aarch64) architectures. Users running Linux on ARM-based hardware (such as Raspberry Pi 4/5, Apple Silicon Macs via Linux VMs, or AWS Graviton instances) cannot easily install or run Buzz without building from source manually.

Describe the solution you'd like
Add Linux ARM64 target support to the automated CI/CD release workflow to build, package, and upload the following artifacts alongside existing releases:

1. Standard Linux ARM64 binary archive (.tar.gz or release binary)
2. Linux ARM64 Debian package (.deb)

Describe alternatives you've considered
Building from source manually on ARM64 devices, which requires setting up the full build environment, dependencies, and compilation toolchains on each local target machine.

Additional context

• Expanding build matrix targets to include linux/arm64 / aarch64 in GitHub Actions (or equivalent CI pipelines).
• Ensuring .deb package creation includes the correct Architecture: arm64 control metadata.