Using Tailscale with an OrbStack VM on macOS

Here's an example of how to build an Ubuntu VM using OrbStack on macOS and then connect to the VM through Tailscale SSH using an auth key stored in Apple Keychain. For example, I can create a VM on my Mac mini at home that hosts a git repo or even a Forgejo server. A colleague in my Tailnet can then connect to this VM to clone, push or pull source code changes from a coffeeshop or airliner while not exposing the rest of my Mac mini.