Github Submodules Support for Cloud Build with Firebase App Hosting

Currently, Firebase App Hosting deployments via Cloud Build do not support the inclusion and proper handling of Github submodules. This limits the ability to manage and reuse code across projects, especially for shared UI components, libraries, or configuration files. When a Firebase project relies on submodules, the Cloud Build process fails or deploys an incomplete application because the submodule content is not fetched during the build.