Motivation for this change

I noticed that the restartTriggers in this module were wrong.

Note that this new value for restartTriggers is a best effort - we can't tell if the content of a password file has changed, so we assume the content of a password file is different if the path to the password file has changed. Another option is to only pass the contents of the configuration file to restartTriggers and have the user manually restart the service if the password changes. Or tell the user to utilize something like nix-sops 🤷‍♂️

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.