Unfortunately you can’t install add-ons in a core/container install.
As an alternative you can install most programs that are equivalent or give you the same functions in docker on your own.
I use home assistant container and use wireguard as my VPN instead of tailscale- you can install Wireguard as a container in docker fairly easily. I wrote up detailed directions here
You should be able to install tail scale in docker as well - then docker will manage all the dependencies for you