Apple Silicon (M1) macOS runners (aarch64)

So it seems Apple Silicon (M1) macOS runners are now available on GitHub Actions.
https://github.com/orgs/community/discussions/69211

In the limitation section of https://opensource.axo.dev/cargo-dist/book/ci/github.html#bring-your-own-release you say:

> GitHub currently only provides x86_64 macOS runners. When you request packages, the Intel versions will always be installed regardless of build targets. While Apple Silicon builds can use CLI tools installed this way, you will not be able to build software for Apple Silicon if it requires C libraries from Homebrew.

I guess things can be easily adapted so that releases with dependencies from Homebrew now work!

Start with the Bring Your Own Release section in book/ci/github.html and compare its limitation about x86_64 macOS runners with the GitHub Actions runner availability described in discussion 69211. Done means the documented runner behavior and Homebrew-dependent Apple Silicon release support accurately reflect current GitHub Actions capabilities.

Written by the indexing model from the issue text.