Reuse official binaries in homebrew

[ptodev]

Request

The homebrew recipe for Alloy is currently building Alloy form source instead of reusing the official binaries from our releases. It would be good to reuse the official binaries - the installation would be faster, and wouldn't require installing things like Go. Maybe it also wouldn't require "node" and "yarn"?

Use case

Faster installations and simpler code.

[hainenber]

IIRC, you'll need to perform code signing for Alloy binaries if users want to install it on Mac. I'm not sure if there's already one in place (DEB and RPM packages are signed already)

For now, I think we can selectively reuse official binaries for Linux installation.

[rfratto]

I feel like it's against the Homebrew expected patterns to directly download pre-built binaries. IMO we should try to make our Formula feel as native to Homebrew as possible, although that means going through the extra work of automating building bottles for people who don't want to build from source.

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