shahjahanctg/webapp ? reverse-engineered prompt

Build me a tiny Python web app I can use for learning Git and Jenkins.

I want a simple site that serves a basic homepage, with a clean index.html and a small app.py to run it. Keep it easy to start locally and also make it work in a Docker container. The page can just say something like a welcome message for a Git and Jenkins learning project.

Please make it simple, neat, and easy to understand, since this is just for practice. If you need to, look up current docs online for the best way to run it today.