NixOS package for BookLore

[jvanbruegge]

If anyone is interested, I've packaged BookLore as a NixOS package: NixOS/nixpkgs#425872
With that PR you can run booklore simply by adding this to configuration.nix:

services.booklore = {
  enable = true;
  secretFiles.DATABASE_PASSWORD = "/path/to/secret";
};