Signed-off-by: Christine Dodrill <xe@tailscale.com>
This enables users of nix-shell to automagically have the correct development environment by simply changing directory into a checkout of this repo. For more information on this see the following links: - https://christine.website/blog/how-i-start-nix-2020-03-08 - https://direnv.net/
ipn/ipnserver: enable systemd-notify support