Commits on Jun 10, 2022

1. Switch to heroku/builder:22 in docs and tests …

   Since it supersedes `heroku/buildpacks:20`:
   https://github.com/heroku/builder#heroku-builder-images
   
   Whilst updating the example build output in the README, I noticed
   that the specified commands were incorrect (eg wrong buildpack path),
   so those have been fixed.
   
   In addition, I've switched the hello world example to use the wildcard
   stack, since the code is not stack-specific, and it will save us having to
   remember to update it in the future.
   
   Lastly, updating the Ruby example buildpack to `heroku/builder:22`
   revealed that the buildpack was actually broken and relying on
   system Ruby, so that buildpack has been excluded from using the
   new builder until that is resolved:
   #398

   

   edmorley committed Jun 10, 2022
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