Switch to heroku/builder:22
in docs and tests
#399
Merged
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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).