Utility to update the managed zone for `fcuny.xyz` in Google Cloud DNS.

I use the domain `fcuny.xyz` to run a number of services on an IP provided by Tailscale. I don't want these domains to be visible on the web, but I also want to have a valid HTTPS certificate for them. By having a proper DNS I can use ACME to get the certificates, without making them available.

Instead of updating the subdomains through the [console](https://console.cloud.google.com/net-services/dns/zones/fcuny-xyz/details?project=fcuny-homelab), I can now run this program.

# Run

To update the records, run `nix run .`.