nixos/github-runners: use `Runner.Listener` directly for registration

Nothing the script `config.sh` does prior to the final call to
`Runner.Listener configure` is relevant for the systemd service.
Particularly, we don't need (nor want) any of the artifacts the `env.sh`
script creates.

Changed files
+1 -1
nixos
modules
services
continuous-integration
github-runner
+1 -1
nixos/modules/services/continuous-integration/github-runner/service.nix
···
else
args+=(--token "$token")
fi
-
${cfg.package}/bin/config.sh "''${args[@]}"
+
${cfg.package}/bin/Runner.Listener configure "''${args[@]}"
# Move the automatically created _diag dir to the logs dir
mkdir -p "$STATE_DIRECTORY/_diag"
cp -r "$STATE_DIRECTORY/_diag/." "$LOGS_DIRECTORY/"