I don't know what changed, but my self-hosted Gitea instance has wrecked itself.
It seems to be an issue somewhere with Cloudflare DNS, because LetsEncrypt keeps trying to dial a random cloudflare (nameserver?) IP instead of the actual public IP I've set on the A record...
I can't figure it out, and I can't find anyone having the same issue either.
This was all just working like 3 days ago.
Bollocks.