chore: remove standalone postgres-db for swarm deployments

docker-compose.yml

@@ -1,33 +1,16 @@
 version: '3.8'
 
 services:
-  postgres-db:
-    image: postgres:15-alpine
-    environment:
-      - POSTGRES_USER=${DB_USER:-admin}
-      - POSTGRES_PASSWORD=${DB_PASSWORD:-password}
-      - POSTGRES_DB=${DB_NAME:-inventory}
-    volumes:
-      - postgres-data:/var/lib/postgresql/data
-    deploy:
-      restart_policy:
-        condition: on-failure
-
   inventory-app:
     image: git.proit.id/ypratama/portal-inventory:latest
     ports:
       - "3000:3000"
     environment:
       - NODE_ENV=production
-      - DATABASE_URL=${DATABASE_URL:-postgresql://${DB_USER:-admin}:${DB_PASSWORD:-password}@postgres-db:5432/${DB_NAME:-inventory}?schema=public}
-      - SESSION_SECRET=${SESSION_SECRET:-default_secret_please_change}
+      - DATABASE_URL=${DATABASE_URL}
+      - SESSION_SECRET=${SESSION_SECRET}
     deploy:
       mode: replicated
       replicas: 1
       restart_policy:
         condition: on-failure
-    depends_on:
-      - postgres-db
-
-volumes:
-  postgres-data: