Less than ideal solution for launching different apps from one codebase on Heroku

api.config

# Config var set on api
ENV['APP']='thin start -R lib/api/config.ru -p $PORT -e $RACK_ENV'

app.config

# Config var set on app
ENV['APP']='thin start -p $PORT -e $RACK_ENV'

Procfile

web: bundle exec $APP