cp: docs: Docker install path, Python 3.13.14 refs, enroot GPU toolkit (2725) into r0.6.0

docker/Dockerfile

@@ -43,7 +43,8 @@ apt-get install -y --no-install-recommends \
     git \
     wget \
     less \
-    vim
+    vim \
+    gnupg
 
 apt-get purge -y \
     ffmpeg \
@@ -68,6 +69,19 @@ curl -fSsL -o /tmp/enroot.deb \
 apt-get install -y /tmp/enroot.deb
 rm /tmp/enroot.deb
 
+# Install nvidia-container-toolkit so enroot's NVIDIA hook
+# (/etc/enroot/hooks.d/98-nvidia.sh) can find nvidia-container-cli to inject
+# GPUs into enroot sandboxes. Without this, enroot sandboxes that request a
+# GPU fail at the hook step even though the outer container has GPU access.
+curl -fsSL https://nvidia.github.io/libnvidia-container/gpgkey \
+    | gpg --dearmor -o /usr/share/keyrings/nvidia-container-toolkit-keyring.gpg
+curl -s -L https://nvidia.github.io/libnvidia-container/stable/deb/nvidia-container-toolkit.list \
+    | sed 's#deb https://#deb [signed-by=/usr/share/keyrings/nvidia-container-toolkit-keyring.gpg] https://#g' \
+    > /etc/apt/sources.list.d/nvidia-container-toolkit.list
+apt-get update
+apt-get install -y nvidia-container-toolkit
+rm -f /etc/apt/sources.list.d/nvidia-container-toolkit.list /usr/share/keyrings/nvidia-container-toolkit-keyring.gpg
+
 apt-get clean
 rm -rf /var/lib/apt/lists/*
 EOF

fern/versions/latest/pages/contribute/development-setup.mdx

@@ -13,7 +13,7 @@ git clone git@github.com:NVIDIA-NeMo/Gym.git
 cd Gym
 curl -LsSf https://astral.sh/uv/install.sh | sh
 source $HOME/.local/bin/env
-uv venv --python 3.12
+uv venv --python 3.13.14
 source .venv/bin/activate
 uv sync --extra dev
 
@@ -191,7 +191,7 @@ For GPG instead of SSH: generate a key, set `user.signingkey` to the key ID, lea
 ### Testing Issues
 
 **Problem**: Tests fail locally but not in CI
-- Check Python version (3.12+ required)
+- Check Python version (3.13.14+ required)
 - Ensure all dependencies installed: `uv sync --extra dev`
 - Run in clean environment
 

fern/versions/latest/pages/get-started/installation.mdx

@@ -5,7 +5,7 @@ position: 2
 ---
 
 <Info>
-Python 3.12 is required. Refer to [Prerequisites](/get-started/prerequisites) for full system requirements.
+Python 3.13.14 is required. Refer to [Prerequisites](/get-started/prerequisites) for full system requirements.
 </Info>
 
 Install from PyPI for the quickest setup. Clone from git if you need the latest features and environments, or use a NeMo RL container if you intend to train with NeMo Gym and NeMo RL.
@@ -14,25 +14,25 @@ Install from PyPI for the quickest setup. Clone from git if you need the latest
 <Tab title="PyPI">
 
 ```bash
-python3.12 -m pip install nemo-gym
+python3.13 -m pip install nemo-gym
 ```
 
 Or with [uv](https://docs.astral.sh/uv/):
 
 ```bash
-uv venv --python 3.12 && source .venv/bin/activate
+uv venv --python 3.13.14 && source .venv/bin/activate
 uv pip install nemo-gym
 ```
 
-The package includes built-in environments and CLI commands. Config and data paths resolve against the package install location automatically. To pin a release: `python3.12 -m pip install nemo-gym==0.4.0`.
+The package includes built-in environments and CLI commands. Config and data paths resolve against the package install location automatically. To pin a release: `python3.13 -m pip install nemo-gym==0.5.1`.
 
 </Tab>
 <Tab title="Git">
 
 ```bash
 git clone git@github.com:NVIDIA-NeMo/Gym.git
 cd Gym
-uv venv --python 3.12 && source .venv/bin/activate
+uv venv --python 3.13.14 && source .venv/bin/activate
 uv sync
 ```
 
@@ -41,13 +41,49 @@ uv sync
 
 Container choice depends on your NeMo Gym version and model recipe. See [RL Framework Compatibility](/reference/rl-framework-compatibility) for the full mapping.
 
-For NeMo Gym **v0.4.0** with the Nemotron 3 Super recipe, pull the NeMo RL v0.7.0 container. This container includes NeMo Gym v0.4.0:
+### Pre-built NeMo Gym image
+
+NeMo Gym publishes a pre-built container to NGC with each release, tagged with the release version (for example `v0.5.1`):
 
 ```bash
-docker pull nvcr.io/nvidia/nemo-rl:v0.7.0
+docker run --gpus all -it --rm \
+  -v "$PWD:/workspace" \
+  --shm-size=128g \
+  --ipc=host \
+  -p 8888:8888 \
+  -p 6006:6006 \
+  --ulimit memlock=-1 \
+  --ulimit stack=67108864 \
+  nvcr.io/nvidian/nemo-gym:v0.5.1
 ```
 
-For the historical NeMo Gym **v0.3.0** and Nemotron 3 Ultra pairing, build the container from the NeMo RL `ultra-v3` branch (there is no pre-built NGC tag for this pairing):
+The image's default entrypoint is `gym`, so it drops you straight into the CLI. To get a shell instead, override the entrypoint:
+
+```bash
+docker run --gpus all -it --rm \
+  --entrypoint /bin/bash \
+  -v "$PWD:/workspace" \
+  --shm-size=128g \
+  --ipc=host \
+  -p 8888:8888 \
+  -p 6006:6006 \
+  --ulimit memlock=-1 \
+  --ulimit stack=67108864 \
+  nvcr.io/nvidian/nemo-gym:v0.5.1
+```
+
+<Note>
+The image ships the `enroot` sandbox backend along with `nvidia-container-toolkit`,
+so enroot's NVIDIA GPU hook (`/etc/enroot/hooks.d/98-nvidia.sh`) can find
+`nvidia-container-cli` and inject GPUs into enroot sandboxes. If your workload
+doesn't need GPUs inside enroot sandboxes (for example CPU-only
+SWE-bench-style tasks) and you see hook-related errors, you can remove the
+hook: `rm /etc/enroot/hooks.d/98-nvidia.sh`.
+</Note>
+
+### NeMo RL recipe containers
+
+For NeMo Gym **v0.3.0** with the Nemotron 3 Ultra recipe, build the container from the NeMo RL `ultra-v3` branch (there is no pre-built NGC tag for this pairing):
 
 This command uses Docker Buildx and Docker 23+ syntax. By default, Docker builds for your host platform; add `--platform` only if you need to target a different architecture.
 
@@ -79,8 +115,8 @@ gym --version
 You should see output like:
 
 ```text
-NeMo Gym v0.4.0
-Python 3.12.x
+NeMo Gym v0.5.1
+Python 3.13.14
 Installation: /path/to/Gym
 ```
 

fern/versions/latest/pages/get-started/prerequisites.mdx

@@ -23,7 +23,7 @@ Individual environments may have additional requirements (e.g., GPU for local vL
 | Component | Requirement |
 |-----------|-------------|
 | OS | Linux (Ubuntu 20.04+), macOS (11.0+), or Windows (WSL2) |
-| Python | 3.12 or higher |
+| Python | 3.13.14 or higher |
 | [uv](https://docs.astral.sh/uv/getting-started/installation/) | Latest recommended |
 
 ## Quickstart Requirements

fern/versions/latest/pages/training-tutorials/nemo-rl-grpo/setup.mdx

@@ -216,7 +216,7 @@ Clone and setup the Gym Python environment:
 ```bash
 # Setup Gym local venv
 cd 3rdparty/Gym-workspace/Gym
-uv venv --python 3.12 --allow-existing .venv
+uv venv --python 3.13.14 --allow-existing .venv
 source .venv/bin/activate
 uv sync --active --extra dev
 ```