nixos/geoipupdate: Run the service right away one time
nixos/geoipupdate: Run the service right away one time

We don't want to have to wait for the timer to expire for the updater
to make its first run. This adds a timer unit which triggers the
geoipupdate.service unit immediately, but only runs if the configured
DatabaseDirectory doesn't exist yet.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs