Worked on integrating Docker registry support into the facebook/buck2-prelude repository by developing a new Buck rule, fetch_image_from_registry, using Starlark for build system configuration. This rule automated the retrieval of Docker images from an internal registry, streamlining their inclusion in Antlir images and fbpkgs. The implementation introduced a uses_docker_registry label within genrule_local_labels.bzl, enabling build flows to securely and reproducibly source images from trusted registries. By focusing on build automation and reliability, the work reduced manual provisioning steps and improved consistency across the pipeline. The contribution demonstrated depth in build system configuration and Starlark scripting for infrastructure automation.