Updating config file to look for env. variable, if not available use it from the JSON

docker-compose.yml

@@ -3,15 +3,16 @@ version: "3.7"
 services:
     db:
         image: "postgres"
+        restart: always
         environment:
             - "POSTGRES_PASSWORD=pyshelf"
             - "POSTGRES_USER=pyshelf"
             - "POSTGRES_DB=pyshelf"
         volumes:
             - "db_data:/var/lib/postgresql/data/"
-
     pyshelf:
         image: "pyshelf/pyshelf"
+        restart: always
         ports: 
             - "8000:8000"
             - "1337:1337"
@@ -19,6 +20,5 @@ services:
             - "${LOCAL_BOOK_DIR}:/books"
         depends_on:
             - db
-
 volumes:
     db_data: