fix docker compose file and docker

.env.example

@@ -0,0 +1,12 @@
+# Django Settings
+DEBUG=False
+SECRET_KEY=your-secret-key-here-change-in-production
+ALLOWED_HOSTS=localhost,127.0.0.1,yourdomain.com
+
+# Database Configuration (Postgres)
+DB_ENGINE=postgresql
+DB_NAME=portfolio_admin
+DB_USER=postgres
+DB_PASSWORD=postgres
+DB_HOST=db
+DB_PORT=5432