nixos/roundcube: add example for database.passwordFile

[h7x4]

Add an example showing how services.roundcube.database.passwordFile should look like. This is described in the description as well, but is easy to overlook due to the name of the option and the format is probably not going to change anytime soon.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[FliegendeWurst]

You changed the type to path, so you have to update the usage below too.

[h7x4]

I'm not exactly sure where you want me to update the usage. Just to make sure we're talking about the same thing, lib.types.path checks that there is a / at the start of the string and should not be confused with the nix path datatype. I don't think this change should cause any breakage.

nixpkgs/lib/types.nix

Lines 525 to 530 in 0867641

	path = mkOptionType {
	name = "path";
	descriptionClass = "noun";
	check = x: isStringLike x && builtins.substring 0 1 (toString x) == "/";
	merge = mergeEqualOption;
	};

[FliegendeWurst]

Ah okay.