Tomoki Nakamaru improved Docker image hygiene and build efficiency across six repositories, including agiresearch/AIOS, inclusionAI/AWorld, and kubernetes-sigs/kueue. He standardized and enhanced .dockerignore patterns using Dockerfile syntax to exclude Python caches, temporary files, and OS-generated artifacts, addressing misconfigurations and reducing image sizes. By refining build contexts and eliminating unnecessary files, Tomoki enabled faster, more reliable deployments and minimized CI/CD variability. His work demonstrated a strong grasp of Docker and cross-repository collaboration, resulting in cleaner builds and improved operational stability. The depth of his contributions reflects a thoughtful approach to optimizing containerization workflows and maintaining codebase consistency.