Add Heroku-24 and ARM support

[schneems]

• Rewrites the project to use a pre-built JRuby binary. Links to downloads are at https://www.jruby.org/download.
• Adds the heroku-24 base image as a build target
• Re-uses the ARM url format for S3 that was introduced in Add AMD (x86_64) and ARM (aarch64) on Heroku-24 docker-heroku-ruby-builder#38. Both the Ruby classic buildpack and CNB are tightly coupled to this format and will attempt to download binaries from S3 with cpu architecture information on heroku-24. Once built and uploaded to S3 there should be no changes needed to the buildpack to acquire support for heroku-24 and ARM due to:
  • Heroku-24 and multi-arch (arm/amd) heroku-buildpack-ruby#1439
  • Support Heroku-24 and ARM architecture buildpacks-ruby#284

[edmorley]

Thank you for working on this!

I've mostly only skim read through quickly, since I presume you've tested this (or will shortly) :-)

[edmorley]

Confirmed working with the Ruby CNB in:
heroku/buildpacks-ruby#286

Confirmed working with the classic Ruby buildpack via:

$ git clone https://github.com/heroku/jruby-getting-started && cd jruby-getting-started
$ hs create --stack heroku-24
$ git push heroku main
...
remote: -----> Building on the Heroku-24 stack
remote: -----> Determining which buildpack to use for this app
remote: -----> Ruby app detected
remote:
remote:        ## Warning: Your app needs java
remote:
remote:        The Ruby buildpack determined your app needs java installed
remote:        we recommend you add the jvm buildpack to your application:
remote:
remote:          $ heroku buildpacks:add heroku/jvm --index=1
remote:
remote: -----> Installing Java
remote:
remote: -----> Downloading Buildpack: heroku/jvm
remote: -----> Detected Framework: JVM Common
remote: -----> Installing OpenJDK 1.8... done
remote: -----> Installing bundler 2.4.22
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-3.1.0-jruby-9.4.1.0
remote: -----> Installing dependencies using bundler 2.4.22
...
remote:        Bundle completed (99.34s)
remote:        Cleaning up the bundler cache.
remote:
remote: ###### WARNING:
remote:
remote:        Installing a default version (20.9.0) of Node.js.
remote:        This version is not pinned and can change over time, causing unexpected failures.
remote:
remote:        Heroku recommends placing the `heroku/nodejs` buildpack in front of
remote:        `heroku/ruby` to install a specific version of node:
remote:
remote:        https://devcenter.heroku.com/articles/ruby-support#node-js-support
remote:
remote: -----> Installing node-v20.9.0-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
...
remote:        Asset precompilation completed (13.11s)
remote:        Cleaning assets
remote:        Running: rake assets:clean
remote: -----> Detecting rails configuration
remote:
remote: ###### WARNING:
remote:
remote:        Installing a default version (20.9.0) of Node.js.
remote:        This version is not pinned and can change over time, causing unexpected failures.
remote:
remote:        Heroku recommends placing the `heroku/nodejs` buildpack in front of
remote:        `heroku/ruby` to install a specific version of node:
remote:
remote:        https://devcenter.heroku.com/articles/ruby-support#node-js-support
remote:
remote: ###### WARNING:
remote:
remote:        There is a more recent Ruby version available for you to use:
remote:
remote:
remote:
remote:        The latest version will include security and bug fixes. We always recommend
remote:        running the latest version of your minor release.
remote:
remote:        Please upgrade your Ruby version.
remote:
remote:        For all available Ruby versions see:
remote:          https://devcenter.heroku.com/articles/ruby-support#supported-runtimes
remote:
remote:
remote: -----> Discovering process types
remote:        Procfile declares types     -> web
remote:        Default types for buildpack -> console, rake
remote:
remote: -----> Compressing...
remote:        Done: 138.5M
...
$ curl -I https://afternoon-waters-10754-b47c641c8e18.herokuapp.com/
HTTP/1.1 200 OK
...