fix: corregir env_file path en docker-compose (../.env → .env)

Jenkins copia el secret a deployments/.env — el path debe ser relativo
al docker-compose.yml, no a la raíz del workspace.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deployments/docker-compose.yml

@@ -27,7 +27,7 @@ services:
     container_name: ${APP_CONTAINER_NAME:-django_core_app}
     restart: unless-stopped
     env_file:
-      - ../.env
+      - .env
     environment:
       - DB_HOST=db
       - DB_PORT=5432