Change the GitHub Release Hook to use custom script to build, package and release a binary

[tapthaker]

We were earlier relying on rust-build/[email protected] for cross target building. Instead we use a custom script and the right host to execute that script on to ensure that building happens.

Tested on my fork by creating a release https://github.com/tapthaker/tmux-thumbs/releases/tag/test5

The main goal of this exercise is to support aarch64-darwin-apple target i.e. all the Apple Silicon Macs

Resolves https://github.com/fcsonline/tmux-thumbs/issues/124 once you create a new release after merging this PR