Add bubblewrap support for running nix2gpu without a container runtime

[baileylu121]

Add bubblewrap support for running nix2gpu without a container runtime

This PR updates the flake dependencies and switches from the baileylu/minimize-flake branch to the baileylu/bubblewrap branch of nimi.

Allow creation of the template

Adds a templates module and renames the basic template to default, making it available via nix flake init -t github:weyl-ai/nix2gpu.

Fix typo

Fixes a missing colon in the getting-started.md documentation.

Bind to nimi's bubblewrap with equivalency to the container config

Adds bubblewrap configuration to match container behavior, allowing nix2gpu containers to run in bubblewrap sandboxes. This includes:

• Setting up filesystem binds for copyToRoot packages
• Configuring GPU device access
• Ensuring proper environment variables
• Updating the startup script to handle bubblewrap environments

Optimize the calling to only evaluate the nimi module once

Refactors the container creation to evaluate the nimi module once and reuse the configuration for both container image and bubblewrap.

Properly bind gpu drivers

Adds comprehensive GPU device bindings for NVIDIA devices and configures the proper procfs access needed for GPU drivers to function in bubblewrap.

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Note

Medium Risk
Touches core container build/startup paths and bumps key flake dependencies (including nixpkgs and nimi), which can affect runtime behavior and compatibility across environments.

Overview
Adds bubblewrap mode support so nix2gpu instances can run via a new runInBubblewrap wrapper without Docker/Podman, including automatic copyToRoot bind-mounting, env/user/working-dir translation, and extensive NVIDIA library/device + /proc handling.

Updates startup/init behavior for bubblewrap (tmpfs dirs, populating /etc, SSH port rewrite to 2222, root auth handling), adds a NixOS check to exercise bubblewrap execution, and tweaks the container-runtime check to expose SSH. Documentation is expanded with a new docs/bubblewrap.md, and the repo adds a flake.templates.default template plus bumps nixpkgs/nimi (switching to baileylu/bubblewrap) and other flake inputs.

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[baileylu121]

• Add bubblewrap support for running nix2gpu without a container runtime #12 👈 (View in Graphite)
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