add docker setup

docker-compose.yml

@@ -4,23 +4,30 @@ services:
 
   db:
     image: postgres
-    #restart: always
+    restart: always
+    volumes:
+      - ./data:/var/lib/postgresql/data
     ports:
       - 5432:5432
     environment:
-      POSTGRES_USER: user
-      POSTGRES_PASSWORD: password
+      - POSTGRES_DB=diesel_demo
+      - POSTGRES_USER=user
+      - POSTGRES_PASSWORD=password
 
   adminer:
     image: adminer
-    #restart: always
+    restart: always
     ports:
       - 3000:8080
 
   # photos:
   #   build: .
   #   environment:
-  #     - DATABASE_URL="postgres://user:password@db/diesel_demo"
+  #     - DATABASE_URL=postgres://user:password@db/diesel_demo
+  #   restart: always
   #   ports:
   #     - 8081:8081
-    
+  #   depends_on:
+  #     - db
+  #   links:
+  #     - db