Sayan-Ghosh-5/Workflow-Automation-Tool ? reverse-engineered prompt

Build me a small Spring Boot service that takes a GitHub pull request, fetches the PR details and diff from GitHub, and then uses OpenAI to generate a short, easy to read summary of the changes. I want it to feel like a simple backend tool I can run locally or in Docker, with just a GitHub personal access token and an OpenAI API key set as environment variables.

Please make it ready to run with Maven, include the basic configuration needed for those secrets, and keep it clean and lightweight. The goal is for someone to point it at a PR and get back a concise summary that helps understand what changed without reading the whole diff. If you need to check the latest Spring AI or GitHub API setup details, look them up online and use the current recommended approach.