fix: CI — nixpkgs-fmt formatting violations and mkRenamedOptionModule arity

[Copilot]

Three issues prevented CI from running successfully after the workflow was introduced.

Changes

• nixos/rustfs.nix — lib.mkRenamedOptionModule accepts exactly 2 arguments (from: [String]) → (to: [String]) → Module; the spurious 3rd string argument would cause nix flake check to fail at module evaluation time
• examples/flake.nix — Remove trailing whitespace on blank line (nixpkgs-fmt compliance)
• examples/nixos-configuration.nix — Remove trailing whitespace on blank lines (nixpkgs-fmt compliance)
• nixos/rustfs.nix — Reformat to nixpkgs-fmt canonical style: function argument list style, if-then-else indentation, and ++ chain indentation

# Before — fails nix flake check (module called with string, not attrset)
(lib.mkRenamedOptionModule
  [ "services" "rustfs" "accessKey" ]
  [ "services" "rustfs" "accessKeyFile" ]
  "World readable secrets is insecure…"   # ← invalid 3rd arg
)

# After
(lib.mkRenamedOptionModule
  [ "services" "rustfs" "accessKey" ]
  [ "services" "rustfs" "accessKeyFile" ]
)

# Before — non-canonical if-then-else alignment style
volumesStr = if builtins.isList cfg.volumes
             then lib.concatStringsSep "," cfg.volumes
             else cfg.volumes;

# After — nixpkgs-fmt canonical style
volumesStr =
  if builtins.isList cfg.volumes
  then lib.concatStringsSep "," cfg.volumes
  else cfg.volumes;

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[houseme]

@copilot 'actions/checkout@v6' is the stable version

[Copilot]

@copilot 'actions/checkout@v6' is the stable version

Restored to actions/checkout@v6 in e587a61. The actual CI failure was the nixpkgs-fmt formatting check — 3 Nix files had formatting issues (trailing whitespace and non-canonical if-then-else alignment). Fixed by running nixpkgs-fmt on all three files.

[Copilot]

Pull request overview

This PR fixes CI failures introduced by the new workflow by correcting a NixOS module evaluation error and aligning example/config files with nixpkgs-fmt formatting requirements.

Changes:

• Fix lib.mkRenamedOptionModule usage in the RustFS NixOS module by removing an invalid third argument that breaks nix flake check during module evaluation.
• Apply nixpkgs-fmt-compatible formatting updates in nixos/rustfs.nix (argument list and expression indentation).
• Remove trailing whitespace on blank lines in example Nix files to satisfy nixpkgs-fmt --check.

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
nixos/rustfs.nix	Fixes module evaluation by correcting mkRenamedOptionModule arity and applies canonical nixpkgs-fmt formatting.
examples/nixos-configuration.nix	Removes trailing whitespace on blank lines to satisfy formatter checks.
examples/flake.nix	Removes trailing whitespace on blank lines to satisfy formatter checks.

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