- further refactor nested conditional to make it clearer
- allow running on Linux while still excluding Apple Silicon
- only warn on `bundle install` failures
Do a very basic developer tools check to ensure that we can compile
things. We cannot use `DevelopmentTools.installed?` because this has
much higher speed requirements and needs to be run before we `require`
anything else.
- Add `HOMEBREW_NO_BOOTSNAP` as well as `HOMEBREW_BOOTSNAP`
- Guard the whole file rather than `raise` on inclusion.
- Use `HOMEBREW_CACHE` instead of `HOMEBREW_TEMP`
- Don't try to use Bootsnap with macOS portable ruby
- rename to `homebrew_bootsnap.rb` to avoid conflicting with the
`bootsnap.rb` we need to `require`
- if the `require` fails: run bundler (until we vendor this gem)
