Deploy NodeJS application from git automatically

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How I solved this:

{ config, pkgs, ... }:

let
  yarn2nix = import (pkgs.fetchFromGitHub {
    owner = "moretea";
    repo = "yarn2nix";
    rev = "780e33a07fd821e09ab5b05223ddb4ca15ac663f";
    sha256 = "1f83cr9qgk95g3571ps644rvgfzv2i4i7532q8pg405s4q5ada3h";
  }) {
    inherit pkgs;
    nodejs = pkgs.nodejs-10_x;
  };

  hafas-client-rpc = yarn2nix.mkYarnPackage {
    src = pkgs.fetchFromGitHub {
      owner = "petabyteboy";
      repo = "hafas-client-rpc";
      rev = "955e776a984cb73f1d31d517963d0b8934f46621";
      sha256 = "0ncm45w3zrgbxxbman4j3j35w063x3jg7ah3lb59qn4g7z7dpx00";
    };
    # hafas-client has a post-install script to generate a random id for the installation
    # yarn ignores this script, and to get reproducible results, we save a fixed id
    pkgConfig.hafas-client.postInstall = ''
      echo '"foo"' > id.json
    '';
  };

in {
  systemd.services.hafas-client-rpc-http = {
    serviceConfig = {
      ExecStart = "${pkgs.nodejs-10_x}/bin/node ${hafas-client-rpc}/bin/hafas-client-rpc";
      Restart = "always";
      RestartSec = "10s";
    };
    after = [ "network.target" ];
    wantedBy = [ "multi-user.target" ];
    environment.PORT = "4000";
  };
}
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