What's the point of entry in go.GoFunction?

[Nikola-Milovic]

Hello everyone, I am writing a golang lambda and in CDK the entry field is mandatory and explain as such

(property) GoFunctionProps.entry: string

The path to the folder or file that contains the main application entry point files for the project.

This accepts either a path to a directory or file.

But I am providing a bundling field that has a dockerImage field and that image has all of the necessary information about the entrypoint and how to build the actual container. So what is the need of entry, or at least, why is it mandatory?

docs for reference (I am using Typescript)