peertube: startup script: exec into nodejs (#352005)

      path = with pkgs; [ nodejs_18 yarn ffmpeg-headless openssl ];

      script = ''

        #!/bin/sh

        umask 077

        cat > /var/lib/peertube/config/local.yaml <<EOF

        ${lib.optionalString (cfg.secrets.secretsFile != null) ''

        ln -sf ${cfg.package}/config/default.yaml /var/lib/peertube/config/default.yaml

        ln -sf ${cfg.package}/client/dist -T /var/lib/peertube/www/client

        ln -sf ${cfg.settings.storage.client_overrides} -T /var/lib/peertube/www/client-overrides

        node dist/server

        exec node dist/server

      '';

      serviceConfig = {

        Type = "simple";