Add Dockerfile for hosting MentalBERT embedding server

Dockerfile

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+# Use an official Python image
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Copy the app files into the container
+COPY . .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Expose the default port used by Hugging Face Spaces
+EXPOSE 7860
+
+# Run the FastAPI app using uvicorn
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]