Add Dockerfile for Docker deployment

Dockerfile

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+# Read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
+FROM python:3.9
+
+RUN useradd -m -u 1000 user
+
+USER user
+
+ENV PATH="/home/user/.local/bin:$PATH"
+
+WORKDIR /app
+
+COPY --chown=user:user requirements.txt requirements.txt
+
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+COPY --chown=user:user . /app
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]