fix: koillection not serving big collections

SwarselSystems.org

@@ -9179,6 +9179,11 @@ To get other URLs (token, etc.), use https://<kanidmDomain>/oauth2/openid/<clien
             locations = {
               "/" = {
                 proxyPass = "http://${serviceName}";
+                extraConfig = ''
+                  proxy_buffer_size          128k;
+                  proxy_buffers              4 256k;
+                  proxy_busy_buffers_size    256k;
+                '';
               };
             };
           };