I believe either should be fine. You can deploy your app to a cloud platform like Heroku or Netlify as a live demo and/or provide instructions in your Git repo README for the judges to run & test. Since open source licensing of the app's code is one of the requirements, I assume the judges are developers themselves who will be reviewing code & installing your app anyway.
"test the application on their own": Should I provide instructions to use the app as an end user, or a developer?
I believe either should be fine. You can deploy your app to a cloud platform like Heroku or Netlify as a live demo and/or provide instructions in your Git repo README for the judges to run & test. Since open source licensing of the app's code is one of the requirements, I assume the judges are developers themselves who will be reviewing code & installing your app anyway.
Yup, @joellord 's profile says 'Developer Advocate' 👍
Who I think is one of the judges