12. buildpack
• When you git push heroku, Heroku s slug
compiler prepares your code for execution
by the Heroku dyno manager. At the heart
of the slug compiler is a collection of
scripts called a buildpack.
13. custom buildpack
• Custom buildpacks can be used to support
languages or frameworks that are not
convered by Heroku s default buildpacks.
For a list of known third-party buildpacks,
see Third-Party Buildpacks.
see. https://devcenter.heroku.com/articles/buildpacks