julia --project=. app.jl

$ heroku create dashjl-deploy --buildpack https://github.com/Optomatica/heroku-buildpack-julia # change my-dash-app to a unique name    
$ git add . # add all files to git
$ git commit -m 'Initial app boilerplate'
$ git push heroku main # deploy code to Heroku
$ heroku ps:scale web=1  # run the app with one Heroku 'dyno'

$ git status # view the changes
$ git add .  # add all the changes
$ git commit -m 'a description of the changes'
$ git push heroku main