It used to not to. Before the heroku.yml file it did most of the things with eit... | Hacker News

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		xena on May 12, 2022 \| parent \| context \| favorite \| on: I Miss Heroku's DevEx It used to not to. Before the heroku.yml file it did most of the things with either auto detection of build packs and implicit procfile generation. You could git push a vanilla rails app and it would just work. It was magical before then.

jrochkind1 on May 12, 2022 [–]

Still is. I don't use a `heroku.yml`. That appears to be an alternate available path, I don't know how many heroku customers use it.

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