Add gc ttl (#6102) (#6103)

Author: ti-chi-bot

config-templates/complex-cdc.yaml

@@ -98,16 +98,19 @@ cdc_servers:
     deploy_dir: "/tidb-deploy/cdc-8300"
     data_dir: "/tidb-data/cdc-8300"
     log_dir: "/tidb-deploy/cdc-8300/log"
+    # gc-ttl: 86400 
   - host: 10.0.1.2
     port: 8300
     deploy_dir: "/tidb-deploy/cdc-8300"
     data_dir: "/tidb-data/cdc-8300"
     log_dir: "/tidb-deploy/cdc-8300/log"
+    # gc-ttl: 86400 
   - host: 10.0.1.3
     port: 8300
     deploy_dir: "/tidb-deploy/cdc-8300"
     data_dir: "/tidb-data/cdc-8300"
     log_dir: "/tidb-deploy/cdc-8300/log"
+    # gc-ttl: 86400 
 
 monitoring_servers:
   - host: 10.0.1.10