Promote training Dockerfile to Space root

Dockerfile

@@ -0,0 +1,65 @@
+FROM nvidia/cuda:12.2.2-devel-ubuntu22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONPATH=/home/user/app
+ENV HF_HOME=/tmp/.cache/huggingface
+ENV PIP_NO_CACHE_DIR=1
+
+RUN apt-get update -y && \
+    apt-get install -y python3 python3-pip python3-venv git curl && \
+    python3 -m pip install --upgrade pip && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+RUN useradd -m -u 1000 user
+USER user
+ENV HOME=/home/user
+ENV PATH=/home/user/.local/bin:$PATH
+WORKDIR /home/user/app
+
+# Install torch first (heaviest, cached separately)
+RUN pip install torch==2.5.1+cu121 --index-url https://download.pytorch.org/whl/cu121
+
+# Install unsloth's official Colab-compatible dependency bundle.
+# This is the ONLY combination unsloth officially supports and tests.
+RUN pip install "unsloth[colab-new]"
+
+# Install unsloth core (no-deps to not override colab-new pins)
+RUN pip install --no-deps "unsloth @ git+https://github.com/unslothai/unsloth.git"
+
+# Install our additional deps (server + OpenEnv + matplotlib)
+RUN pip install \
+    flask \
+    flask-cors \
+    fastapi \
+    uvicorn \
+    pydantic \
+    requests \
+    openenv-core \
+    PyYAML \
+    matplotlib
+
+# Verify non-GPU imports work
+RUN python3 -c "import torch; print(f'torch={torch.__version__}')" && \
+    python3 -c "import transformers; print(f'transformers={transformers.__version__}')" && \
+    python3 -c "import trl; print(f'trl={trl.__version__}')" && \
+    python3 -c "import datasets; print(f'datasets={datasets.__version__}')"
+
+COPY --chown=user . /home/user/app
+
+RUN pip install --no-deps -e /home/user/app
+
+RUN python3 -m training.generate_warmup_traces
+
+EXPOSE 7860
+
+# The HF Space receives entrypoint.sh at repo root (promoted by tools/upload_all.py),
+# but if someone builds locally from `deploy/training/` it's one directory up.
+RUN if [ -f /home/user/app/entrypoint.sh ]; then \
+        chmod +x /home/user/app/entrypoint.sh; \
+    elif [ -f /home/user/app/deploy/training/entrypoint.sh ]; then \
+        cp /home/user/app/deploy/training/entrypoint.sh /home/user/app/entrypoint.sh && \
+        chmod +x /home/user/app/entrypoint.sh; \
+    fi
+
+CMD ["/home/user/app/entrypoint.sh"]