Motivation for this change

Fix issue #110691

Things done

• Tested via

  • nixosTests.uwsgi

  • nixosTests.searx

  • nixosTests.ihatemoney

  • running this command and checking the directory with stat:

    nix-build -E '(import ./nixos { configuration = { config, pkgs, ... }: { 
        services.uwsgi = {
        enable = true;
        plugins = [ "python3" ];
        instance = {
          type = "emperor";
          vassals = {
            foobar = {
              type = "normal";
              socket = "${config.services.uwsgi.runDir}/foobar.sock";
            };
          };
        };
      };
      users.users.root.password = "";
      }; }).vm'
    

• Ensured that relevant documentation is up to date

• Fits CONTRIBUTING.md.