laurensramandt/inventree-mobile-app-apk-builder ? reverse-engineered prompt

Build me a simple Docker based tool that can compile the open source InvenTree Android app into a signed APK file.

I want to be able to run one Docker build, then start the container and have it produce output/app.apk in a local folder. It should pull the latest stable InvenTree app source from GitHub, set up whatever Android build tools it needs, and handle the first run download pain as part of the process. Please make it easy to use on Windows, Mac, or Linux with Docker, and include clear steps in the README for building the image, running it, and installing the APK on an Android phone.

If there are any setup details that might change over time, look up the current docs online if you need to. Also add a note that the APK is only for sideloading and not for Play Store publishing, and that iOS is not supported.