heroku: added heroku app.json
heroku: added heroku app.json

Bridg/hydra-1,Bridg/hydra-1,ory/hydra,leetal/hydra,ory-am/hydra,ory/hydra,Grillz/hydra,ory-am/go-iam,Bridg/hydra-1,ory/hydra,ory-am/go-iam,ory/hydra,Grillz/hydra