chore: update db variable enviroment.

.env.staging.example

@@ -24,10 +24,10 @@ CSRF_TRUSTED_ORIGINS=http://localhost:8000,http://127.0.0.1:8000
 
 # PostgreSQL Database Configuration (staging local)
 DB_NAME=tienda_ilusion_staging
-DB_USER=tienda_ilusion_user
-DB_PASSWORD=staging_local_password
-DB_HOST=postgres
 DB_PORT=5432
+POSTGRES_DB=tienda_ilusion_staging
+POSTGRES_USER=tienda_ilusion_user
+POSTGRES_PASSWORD=tienda_ilusion_password
 
 # Email Configuration (console backend para staging)
 EMAIL_HOST=smtp.gmail.com