Add docker composition for backend

docker-compose.yml

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+version: '3'
+volumes:
+  reports:  
+
+services:
+
+  # Select between the next 2 services the backend you want to use by
+  # commenting / uncommenting the 'volume' section &  modify the links alias
+  # on the mviewer-studio service.
+  #
+  # You cannot use both backends at the same time, and you have to be wary if
+  # you switch from one to another, as each comes with a custom config.json
+  # file.
+  #
+  # If you want to switch, make sure either you modify the config.json, or
+  # reinitialize the docker volume.
+
+
+  # Python version
+  mreport-backend:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile-backend
+    image: mreport/mreport:python-latest
+    volumes:
+      - "reports:/home/apprunner/backend/reports"      
+
+

docker/Dockerfile-backend

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+FROM python:3.7-slim
+
+RUN useradd -r -m apprunner
+
+USER apprunner
+
+ENV HOME=/home/apprunner
+ENV PATH=$HOME/.local/bin:$PATH
+
+WORKDIR /home/apprunner
+
+COPY requirements.txt .
+COPY config.py .
+RUN pip install --user -r requirements.txt
+
+COPY --chown=apprunner:apprunner backend backend
+RUN pip install --user backend && pip install --user gunicorn
+
+
+VOLUME [ "/home/apprunner/backend/reports" ]
+
+
+CMD ["gunicorn", "-w 4", "-b 0.0.0.0:8000", "backend:app"]