Create Dockerfile

Dockerfile

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+FROM python:3.9-slim
+
+# 1. System libs for OpenCV
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        libgl1-mesa-glx libglib2.0-0 libsm6 libxext6 libxrender1 libfontconfig1 && \
+    rm -rf /var/lib/apt/lists/*
+
+# 2. Python deps
+COPY requirements.txt /tmp/
+RUN pip install --no-cache-dir -r /tmp/requirements.txt
+
+# 3. App code
+WORKDIR /app
+COPY . /app
+
+# 4. Expose the Streamlit port used by HF (7860 by default)
+EXPOSE 7860
+
+CMD ["streamlit", "run", "src/streamlit_app.py", \
+     "--server.port", "7860", \
+     "--server.address", "0.0.0.0"]