machines[hera]: increase nofile

machines/hera/configuration.nix

@@ -72,6 +72,10 @@
     group = "root";
   };
 
+  security.pam.loginLimits = [
+    { domain = "*"; item = "nofile"; type = "-"; value = "1048576"; }
+  ];
+
   services.syncthing = {
     enable = true;
     dataDir = "/dev/null";