Add Dockerfile and switch to docker SDK

Dockerfile

@@ -0,0 +1,31 @@
+FROM python:3.13-slim
+
+# Install build dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends build-essential git && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create the non-root user expected by Hugging Face Spaces
+RUN useradd -m -u 1000 user
+
+USER user
+
+ENV HOME=/home/user \
+    PATH=/home/user/.local/bin:$PATH \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PORT=7860
+
+WORKDIR $HOME/app
+
+# Install Python dependencies first to leverage Docker layer caching
+COPY --chown=user requirements.txt .
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application code
+COPY --chown=user . .
+
+EXPOSE 7860
+
+CMD ["python", "app.py"]

README.md

@@ -3,9 +3,7 @@ title: Off Topic Guardrail Demo
 emoji: 🙅
 colorFrom: red
 colorTo: blue
-sdk: gradio
-sdk_version: 5.6.0
-app_file: app.py
+sdk: docker
 pinned: false
 ---
 

requirements.txt

@@ -1,5 +1,5 @@
 gradio
-huggingface-hub==0.25.1
+huggingface-hub
 safetensors
 torch
 transformers