The web service in ~/signup exits as soon as it starts. Its image is built from ~/signup/Dockerfile, and the Dockerfile has more than one fault.

Start from the symptom:

docker compose logs web
cat Dockerfile

Fix the Dockerfile with nano, rebuild, recreate web, and read its logs after each attempt. You are done with this lab when the app gets past its imports and stops on a database error. Leave that error for the next lab.