Question: Why are you installing `postgres-client` and `xdg-utils` in the backend docker image?

I'm curious about why you needed to install these two packages for backend `postgres-client` and `xdg-utils`? Does it not work on container apps unless they are installed or why? https://github.com/Azure-Samples/rag-postgres-openai-python/blob/23fdf6434695d669c092d3e7445aa9b95e7a6915/src/backend/Dockerfile#L3-L6