Click on "Deploy to Heroku" button above and follow the instructions:
The app name argument is optional. If no app name is specified, a random name will be generated. Since Heroku app names are in a global namespace, you can expect that common names, like “blog” or “wiki”, will already be taken. It’s often easier to start with a default name and rename the app later.
Create .env file with required params, point EXIFTOOL_PATH to your local exiftool instance.
Start the application