Ref #178 - Add dockerfile and docker-compose along with env file for …

…database

backend/Dockerfile

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+FROM python:3.6
+
+ADD requirements.txt .
+RUN pip install --upgrade pip
+RUN pip install -r requirements.txt
+
+ADD . /
+WORKDIR /
+
+CMD gunicorn --bind 0.0.0.0:9000 -w 1 app.wsgi
+
+EXPOSE 9000

database.env

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+POSTGRES_USER=rebound_user
+POSTGRES_PASSWORD=-#My6o0dPa33W0rd#-
+POSTGRES_DB=rebound_db

docker-compose.yml

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+version: "3"
+services:
+  backend:
+    build: backend
+    ports:
+      - "9000:9000"
+    environment:
+      WAIT_HOSTS: database:5432
+      DEBUG: 'False'
+  database:
+    image: "postgres:latest"
+    env_file:
+      - database.env
+    ports:
+      - "5432:5432"
+    volumes:
+      - database-data:/var/lib/postgresql/data/
+
+volumes:
+  database-data: