First files upload.

Dockerfile

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+FROM python:3.11-slim
+
+# Install sipcalc and dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends sipcalc && \
+    rm -rf /var/lib/apt/lists/*
+
+# Set up app directory
+WORKDIR /app
+
+# Install Flask
+RUN pip install --no-cache-dir flask
+
+# Copy app code
+COPY app.py .
+
+EXPOSE 5000
+
+CMD ["python", "app.py"]