Fijxu have been using it for more than 3 weeks on their instance and
they report that it works really well.
This only works if 'inv_sig_helper' itself crashes and restarts (via systemd
or docker restart policy) but it will not work if 'inv_sig_helper' hangs and
stops responding to invidious (but this is an issue with 'inv_sig_helper',
not Invidious).
Closes issue 4926
2eeb6a731d