ci: switch formatter from nixpkgs-fmt to nixfmt (RFC style)

Author: znaniye

nix/checks/lint.nix

@@ -1,9 +1,16 @@
 { pkgs, flake, ... }:
 
 pkgs.runCommand "lint-code"
-{ nativeBuildInputs = with pkgs; [ nixpkgs-fmt deadnix statix ]; } ''
-  deadnix --fail ${flake}
-  #statix check ${flake} # https://github.com/nerdypepper/statix/issues/75
-  nixpkgs-fmt --check ${flake}
-  touch $out
-''
+  {
+    nativeBuildInputs = with pkgs; [
+      nixfmt
+      deadnix
+      statix
+    ];
+  }
+  ''
+    deadnix --fail ${flake}
+    #statix check ${flake} # https://github.com/nerdypepper/statix/issues/75
+    nixfmt --check ${flake}
+    touch $out
+  ''

nix/formatter.nix

@@ -2,10 +2,13 @@
 
 pkgs.writeShellApplication {
   name = "normalise_nix";
-  runtimeInputs = with pkgs; [ nixpkgs-fmt statix ];
+  runtimeInputs = with pkgs; [
+    nixfmt
+    statix
+  ];
   text = ''
     set -o xtrace
-    nixpkgs-fmt "$@"
+    nixfmt "$@"
     statix fix "$@"
   '';
 }