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But you do get an email warning you, with a button to say 'no, keep going'.

(I maintain docker images for gocryptfs & mergerfs - https://github.com/OJFord/docker-gocryptfs https://github.com/OJFord/docker-mergerfs - that check for updates to those respective projects and push an updated image; if there's no new upstream version for a while then I get that email and have to click it to keep it running.)

Obviously you can automate that with another repo that has a cron job to push a dummy commit every 30 days.

In fact, they can play ping pong and keep each other going forever :)

You don't need seperate repository for that. You can use Personal Access Token & self-push.

I have a crown action which commits its own log. So, always active!