fix: set nofiles=0 in strfry CI config

The container's ulimit (65536) is lower than the default nofiles
setting (1000000). Setting nofiles=0 tells strfry not to attempt
changing the limit.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matthiasdebernardini

.github/strfry-ci.conf

@@ -24,7 +24,7 @@ relay {
     # Bind to all interfaces so the container is reachable from the host
     bind = "0.0.0.0"
     port = 7777
-    nofiles = 1000000
+    nofiles = 0
     realIpHeader = ""
 
     auth {