fix: correctly detect apple darwin architectures

[mayoreee]

Fixed the method used in the build script for detecting architecture type on Apple Darwin.

Issue being fixed or feature implemented

This fixes issue #19

The current build script relies on the Node.js method os.arch() for detecting architecture type. However, the method is unreliable as it incorrectly detects the Apple Silicon architecture.

Also, this is a known issue with os.arch() which has been reported severally, including here

What was done?

Changed the architecture detection method from Node.js's os.arch() to Unix's uname.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation