Add v0.4.0 `bart` CLI binary executable for macOS - AArch64

[tpmccallum]

We have updated the Bart CLI release assets to include macOS and Windows. We now have the following amd64 bart CLI assets.

bart-cli-v0.4.0-linux-amd64.tar.gz
bart-cli-v0.4.0-macos-amd64.tar.gz
bart-cli-v0.4.0-windows-amd64.zip

It would be great if we could also add support for macOS AArch64.

https://github.com/fermyon/bartholomew/releases/tag/v0.4.0

[vdice]

Do we want to add automation (eg a GitHub Action) to build this binary set and upload it to a new GH release on each tag push?

[karthik2804]

I think adding a GitHub automation would make sense.