Setup workflow dispatch in Actions for metacall/homebrew

[FirePing32]

🚀 Feature

Setup a workflow dispatch event in the current CI to trigger tests and generate binaries for https://github.com/metacall/homebrew.

Is your feature request related to a problem?

Currently all releases are manually created in https://github.com/metacall/homebrew, which requires updating the shasum hash and metacall version. This feature will run a CI workflow to update the brew formula through workflow dispatch.

Describe the solution you'd like

A solution implemented here can be discussed.

Also fixes: metacall/homebrew#8