postgresql needs a superuser password (#231)

Author: MParvin

.env.prod.dist

@@ -5,3 +5,4 @@ DB_CYPHER_KEY=<insert_a_secret_value>
 SECRET_KEY=<insert_another_secret_value>
 DATABASE_URL=postgres://postgres@db:5432/postgres
 DISABLE_DATABASE_SSL_CHECK=1
+POSTGRES_PASSWORD=<insert_a_secure_password>

docker-compose.prod.yml

@@ -3,6 +3,8 @@ version: "3.1"
 services:
   db:
     image: postgres:10
+    env_file:
+      - .env.prod
 
   redis:
     image: redis:5.0-alpine