I just updated a couple of machines to Debian Bullseye and when reinstalling Tailscale on both via the Download page instructions, I get the following error. Everything installs OK, but guessing the method of adding the key needs to be updated?
$ curl -fsSL https://pkgs.tailscale.com/stable/debian/bullseye. gpg | sudo apt-key add -
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (s ee apt-key(8)).