add initial risc0 docker files

.github/workflows/test-risc0-docker.yml

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+name: Test Risc0 (Docker)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test-risc0-via-docker-build:
+    name: Build Risc0 Docker Image
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build ere-base image
+        run: |
+          docker build \
+            --tag ere-base:latest \
+            --file docker/base/Dockerfile.base .
+
+      - name: Build ere-builder-risc0 image
+        run: |
+          docker build \
+            --tag ere-builder-risc0:latest \
+            --file docker/risc0/Dockerfile .

docker/risc0/Dockerfile

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+ARG BASE_IMAGE_TAG=latest
+FROM ere-base:${BASE_IMAGE_TAG}
+
+ARG USERNAME=ere_user
+USER root
+
+# Ensure Cargo/Rustup environment variables are set from the base image for SDK script
+ENV RUSTUP_HOME=/usr/local/rustup \
+    CARGO_HOME=/usr/local/cargo \
+    PATH=/usr/local/cargo/bin:$PATH
+
+# Copy and run the Risc0 SDK installer script
+COPY scripts/sdk_installers/install_risc0_sdk.sh /tmp/install_risc0_sdk.sh
+RUN chmod +x /tmp/install_risc0_sdk.sh
+
+# Run the script without version arguments to install latest
+# TODO: We need to change this in all scripts so that we can fix the version in CI
+RUN /tmp/install_risc0_sdk.sh
+
+# Verify Risc0 installation (script also does this, but good for Dockerfile sanity)
+RUN echo "Verifying Risc0 installation in Dockerfile (post-script)..." && cargo risczero --version
+
+CMD ["/bin/bash"] 

scripts/sdk_installers/install_risc0_sdk.sh

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+#!/bin/bash
+set -e
+
+echo "Installing Risc0 Toolchain using rzup (latest release versions)..."
+
+# Ensure curl and bash are available
+if ! command -v curl &> /dev/null; then echo "Error: curl not found." >&2; exit 1; fi
+if ! command -v bash &> /dev/null; then echo "Error: bash not found." >&2; exit 1; fi
+
+# Install rzup itself if not already present
+if ! command -v rzup &> /dev/null; then
+    echo "Installing rzup..."
+    curl -L https://risczero.com/install | bash
+    # Attempt to add rzup to PATH for the current script execution if it was just installed
+    # Common install location for rzup is $HOME/.cargo/bin
+    if [[ ":$PATH:" != *":$HOME/.cargo/bin:"* ]]; then 
+        export PATH="$HOME/.cargo/bin:$PATH"
+    fi 
+    if ! command -v rzup &> /dev/null; then 
+        echo "Error: rzup still not found after install attempt. Ensure $HOME/.cargo/bin is in your PATH or rzup installed correctly." >&2; 
+        exit 1;
+    fi
+else
+    echo "rzup already installed."
+fi
+
+# Install the latest released Risc0 toolchain
+rzup install
+
+# Verify Risc0 installation
+echo "Verifying Risc0 installation..."
+if ! command -v cargo &> /dev/null; then echo "Error: cargo not found." >&2; exit 1; fi
+cargo risczero --version || (echo "Error: cargo risczero command failed!" >&2 && exit 1)
+
+echo "Risc0 Toolchain installation (latest release) successful."