Fix docker-compose environment variable types

Quote boolean environment variables to ensure Docker Compose compatibility. Docker Compose requires all environment variables to be strings.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -23,15 +23,15 @@ services:
       QUEUE_BULL_REDIS_HOST: redis
       QUEUE_BULL_REDIS_PORT: 6379
       N8N_PAYLOAD_SIZE_MAX: 16
-      EXECUTIONS_DATA_PRUNE: true
+      EXECUTIONS_DATA_PRUNE: "true"
       EXECUTIONS_DATA_MAX_AGE: 168
       EXECUTIONS_DATA_SAVE_ON_ERROR: all
       EXECUTIONS_DATA_SAVE_ON_SUCCESS: all
-      EXECUTIONS_DATA_SAVE_MANUAL_EXECUTIONS: true
+      EXECUTIONS_DATA_SAVE_MANUAL_EXECUTIONS: "true"
       N8N_DEFAULT_BINARY_DATA_MODE: filesystem
       EXECUTIONS_TIMEOUT: 3600
       EXECUTIONS_TIMEOUT_MAX: 7200
-      N8N_SECURE_COOKIE: true
+      N8N_SECURE_COOKIE: "true"
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.n8n.rule=Host(`${DOMAIN}`)"