Developed Manifest List support for container image builds in the containers/podman-py repository, introducing the --manifest flag to streamline multi-architecture workflows. Focused on enhancing the BuildMixin architecture, the work enabled automatic creation and population of manifest lists, associating built images directly within the build process. Expanded both unit and integration tests to ensure robust coverage of the new workflow, prioritizing reliability and maintainability. Leveraged Python for API development, build system enhancements, and comprehensive testing. This feature reduced manual steps in multi-arch image distribution and improved CI/CD pipeline reliability, addressing key challenges in containerization and automated deployment environments.