feat: introduce treefmt and fmt all

nix/devShells.nix

@@ -3,9 +3,8 @@
   self',
   inputs',
   pkgs,
-}: let
-  pkgsUnstable = inputs'.nixpkgs-unstable.legacyPackages;
-in {
+}:
+{
   install = pkgs.mkShell {
     name = "infra-install";
     packages = with pkgs; [
@@ -20,11 +19,9 @@ in {
 
   develop = pkgs.mkShell {
     name = "infra-develop";
-    inputsFrom = [
-      self'.devShells.install
-    ];
+    inputsFrom = [ self'.devShells.install ];
     packages = with pkgs; [
-      self'.formatter
+      self'.formatter # .package
       inputs'.colmena.packages.colmena
       dconf2nix
       inputs'.nixos-anywhere.packages.nixos-anywhere
@@ -92,6 +89,15 @@ in {
     # Set Environment Variables
     RUST_BACKTRACE = 1;
 
-    KANIDM_URL = self.nixosConfigurations.sj-srv1.config.containers.webserver.config.services.kanidm.serverSettings.origin;
+    KANIDM_URL =
+      self.nixosConfigurations.sj-srv1.config.containers.webserver.config.services.kanidm.serverSettings.origin;
+
+    shellHook =
+      (self.inputs.nixago.lib.${pkgs.system}.make {
+        data = self'.formatter.settings;
+        output = "treefmt.toml";
+        format = "toml";
+      }).shellHook
+      + '''';
   };
 }