Nginx worker processes exit with signal 31 when running via systemd

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I did a quick diff between the systemd units in 20.09 and 21.05 and I think this is what you should add to your configuration.nix to test my theory:

systemd.services.nginx.serviceConfig = {
  ProcSubset = lib.mkForce "";
  ProtectProc = lib.mkForce "";
  ProtectClock = lib.mkForce false;
  ProtectKernelLogs = lib.mkForce false;
  RestrictNamespaces = lib.mkForce false;
  RemoveIPC = lib.mkForce false;
  SystemCallFilter = lib.mkForce "";
};

This is likely wrong and we’ll have to fiddle with this a bit (remove one by one until we find the specific option), but it is a starting point so we can figure out exactly which option added caused your issues.