Start NGINX (i.e., nginx_shell.nix) with systemd?

[toraritte]

Listening on privileged ports (e.g., 80) requires running NGINX as root (see https://unix.stackexchange.com/questions/134301/), and currently using the command

sudo $(which nix-shell) \
  --argstr "nix_shell_dir" "${NIX_SHELL_DIR}" \
  --argstr "timestamp" "$(date '+%Y-%m-%d_%H-%M-%S')" \
  --argstr "port" "80" \
  nginx_shell.nix

which works as it should, but if the resolution to issue #23 Add Gunicorn to nginx_shell.nix will be to use systemd, then consider using it here as well. (As far as I can tell, this will simply just mean to invoke the command above in a .service file and have an explicit dependency on the Gunicorn systemd unit. I think.)