Add Dockerfile

Dockerfile

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+# RANS — OpenEnv Spacecraft Navigation Environment
+# HuggingFace Spaces Docker image
+# arXiv:2310.07393
+
+ARG BASE_IMAGE=ghcr.io/meta-pytorch/openenv-base:latest
+FROM ${BASE_IMAGE} AS builder
+
+WORKDIR /app
+
+ARG BUILD_MODE=standalone
+
+# Copy environment code
+COPY . /app/env
+
+WORKDIR /app/env
+
+# Ensure uv is available
+RUN if ! command -v uv >/dev/null 2>&1; then \
+        curl -LsSf https://astral.sh/uv/install.sh | sh && \
+        mv /root/.local/bin/uv /usr/local/bin/uv && \
+        mv /root/.local/bin/uvx /usr/local/bin/uvx; \
+    fi
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install dependencies (handles both uv.lock and lockfile-free setups)
+RUN --mount=type=cache,target=/root/.cache/uv \
+    if [ -f uv.lock ]; then \
+        uv sync --frozen --no-install-project --no-editable; \
+    else \
+        uv sync --no-install-project --no-editable; \
+    fi
+
+RUN --mount=type=cache,target=/root/.cache/uv \
+    if [ -f uv.lock ]; then \
+        uv sync --frozen --no-editable; \
+    else \
+        uv sync --no-editable; \
+    fi
+
+# ── Runtime stage ─────────────────────────────────────────────────────────────
+FROM ${BASE_IMAGE}
+
+WORKDIR /app
+
+COPY --from=builder /app/env/.venv /app/.venv
+COPY --from=builder /app/env /app/env
+
+ENV PATH="/app/.venv/bin:$PATH"
+ENV PYTHONPATH="/app/env:$PYTHONPATH"
+
+# Default task (override via HF Space secrets or docker run -e)
+ENV RANS_TASK=GoToPosition
+ENV RANS_MAX_STEPS=500
+ENV ENABLE_WEB_INTERFACE=true
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || exit 1
+
+CMD ["sh", "-c", "cd /app/env && uvicorn server.app:app --host 0.0.0.0 --port 8000"]