feat: github actions docker build

Dockerfile

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+FROM python:3.9-slim-buster
+
+RUN apt update
+RUN apt install python3-pip -y
+RUN python3 -m pip install --upgrade pip
+RUN apt autoremove -y
+RUN apt clean
+
+WORKDIR /app
+COPY ./ .
+
+RUN python3 -m pip install waitress
+
+COPY req.txt .
+RUN python3 -m pip install --no-cache-dir -r req.txt
+
+RUN mkdir /app/pictures
+
+EXPOSE 5000/tcp
+
+ENTRYPOINT ["waitress-serve"] 
+CMD ["--host", "0.0.0.0", "--port", "5000", "--call", "app:createApp"]