fix(nginx): add Docker DNS resolver to prevent stale upstream IPs

Without resolver 127.0.0.11, nginx caches upstream IPs at startup and
returns 502 after container restarts until manually reloaded.

Authored-By: Jack Levy

nginx/nginx.conf

@@ -8,6 +8,9 @@ http {
     sendfile      on;
     keepalive_timeout 65;
 
+    # Use Docker's internal DNS so upstream IPs re-resolve after container restarts
+    resolver 127.0.0.11 valid=10s ipv6=off;
+
     upstream api {
         server api:8000;
     }