During May 2025, Jakub Tomasiak modernized the rootfs build pipeline for the kata-containers/kata-containers repository, focusing on reliability and configurability for Ubuntu 24.04 environments. He migrated the rootfs builder from multistrap to mmdebstrap, improving build reproducibility and future compatibility. Jakub also updated runtime configurations to support stricter systemd sandboxing, ensuring secure and reliable rootfs builds. By exposing REPO_URL and REPO_COMPONENTS variables, he enabled flexible multi-architecture repository configurations, allowing for custom package sources and components. His work leveraged Shell scripting, Linux packaging, and system administration skills, delivering deeper cross-architecture support and more adaptable deployment pipelines for users.