rpc.yml: cap traefik json-file logs at 512m x2

Replace local driver with max-file:1 (unbounded growth) by json-file
rotation matching generated node services.

rpc.yml

@@ -45,7 +45,7 @@ services:
       - "prometheus-scrape.port=8082"
       - "prometheus-scrape.job_name=traefik"
     logging:
+      driver: json-file
       options:
-        max-file: '1'
+        max-size: "512m"
-        compress: 'false'
+        max-file: "2"
-      driver: local