Heyyy sweet, I have https://git.gmem.ca going through a little Oracle Cloud box, which goes through an nginx reverse proxy over Tailscale. It's not a perfect setup, some SSL weirdness so the SSL terminates on the Oracle box then goes oveer Tailscale to my NAS. But it works! And I spun up CoreDNS on my NAS so I can use it for Split DNS, making sure my own connections go straight over Tailscale :3
Discussion
It does also mean the old route https://vancouver.scorpion-ghost.ts.net/git/ doesn't work anymore, which is a bit annoying but not the end of the world since it's a personal forge anyways.