Working docker compose with PostgreSQL, using mounted volumes, need to change database env vars

database.env

@@ -0,0 +1,3 @@
+POSTGRES_USER=user
+POSTGRES_PASSWORD=password
+POSTGRES_DB=database

docker-compose.yml

@@ -8,4 +8,14 @@ services:
       - ./pwa/:/app
     ports:
       - "3000:3000"
-    container_name: haiti_pwa
+    container_name: haiti_pwa
+    
+  database:
+    image: "postgres" # use latest official postgres version
+    env_file:
+      - database.env # configure postgres
+    volumes:
+      - database-data:/var/lib/postgresql/data/ # persist data even if container shuts down
+        
+volumes:
+  database-data: # named volumes can be managed easier using docker-compose