https://tailscale.com/blog/caddy
Use Caddy to Manage Tailscale HTTPS Certificates
Caddy simplifies HTTPS certificate management for your Tailscale network, automatically provisioning and renewing certificates for web apps.
tailscale httpsusecaddymanagecertificates
https://tailscale.com/docs/how-to/set-up-https-certificates
Enabling HTTPS ยท Tailscale Docs
Configure HTTPS for devices in your Tailscale network.
enablinghttpstailscaledocs
https://stfn.pl/blog/68-tailscale-tls-with-nextcloud/
Access local Nextcloud with HTTPS anywhere by using Tailscale TLS certificates
tls certificatesaccesslocalnextcloud