Create Dockerfile for example repo

Dockerfile

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+# Base image
+FROM python:3.9-slim
+
+# Set the working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    make git curl && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Install Poetry for dependency management
+RUN pip install --no-cache-dir poetry
+
+# Clone the Make Python DevEx repository
+RUN git clone https://github.com/target/make-python-devex.git .
+
+# Install project dependencies using Makefile
+RUN make deps && make deps
+
+# Run checks, tests, and build the project
+RUN make check test build
+
+# Expose the default port (if the application runs on a specific port, update this)
+EXPOSE 8000
+
+# Command to run the application
+CMD ["poetry", "run", "example-make-python-devex"]