add docker

Dockerfile

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+FROM python:3.6-alpine3.7
+
+ADD [".", "/app"]
+WORKDIR /app
+RUN apk add --update g++ gfortran openblas-dev libpng-dev musl-dev freetype-dev
+RUN pip install -r requirements.txt --no-cache-dir
+
+CMD ["python", "bot.py"]

docker-compose.yml

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+version: "2"
+
+services:
+ doorbot:
+  build: .
+  image: fswiai/doorbot:0.2
+  volumes:
+   - ./settings.json:/app/settings.json