make it kubernetes friendly

Dockerfile

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+FROM python:3-slim
+
+ENV TZ Europe/Budapest
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+WORKDIR /app
+
+COPY requirements.txt ./
+
+RUN pip install --no-cache-dir -r requirements.txt && rm -rf requirements.txt
+
+COPY ./geogame .
+
+EXPOSE 8080
+
+ENTRYPOINT ["gunicorn", "-b", "0.0.0.0:8080", "--workers", "4", "--threads", "4", "wsgi:application"]