Create Dockerfile

Dockerfile

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+# Use official Python image
+FROM python:3.9-slim as builder
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV PIP_NO_CACHE_DIR 1
+
+# Install system dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    build-essential \
+    curl \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create and activate virtual environment
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Install Python dependencies
+COPY requirements.txt .
+RUN pip install --upgrade pip && \
+    pip install -r requirements.txt
+
+# --- Runtime stage ---
+FROM python:3.9-slim
+
+# Copy virtual environment from builder
+COPY --from=builder /opt/venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Create non-root user
+RUN useradd -m -u 1000 user && \
+    mkdir -p /app && \
+    chown user:user /app
+
+# Set working directory
+WORKDIR /app
+USER user
+
+# Copy application files
+COPY --chown=user:user . .
+
+# Expose Streamlit port
+EXPOSE 8501
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8501/_stcore/health || exit 1
+
+# Run application
+CMD ["streamlit", "run", "your_app.py", "--server.port=8501", "--server.address=0.0.0.0"]