github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/g3doc (about) BUILD Layers.png Layers.svg Machine-Virtualization.png Machine-Virtualization.svg README.md Rule-Based-Execution.png Rule-Based-Execution.svg Sentry-Gofer.png Sentry-Gofer.svg architecture_guide community.md logo.png logo.txt proposals roadmap.md style.md user_guide