format && add nix-serve for caching

hosts/sin/flake.nix

@@ -14,7 +14,15 @@
   };
 
   # Flake outputs
-    outputs = inputs@{ self, nixpkgs, disko, unstable, agenix, ... }:
+  outputs =
+    inputs@{
+      self,
+      nixpkgs,
+      disko,
+      unstable,
+      agenix,
+      ...
+    }:
     let
       # The systems supported for this flake
       supportedSystems = [
@@ -22,9 +30,14 @@
       ];
 
       # Helper to provide system-specific attributes
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
+      forEachSupportedSystem =
+        f:
+        nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
     in
     {
       nixosConfigurations.zimablade = nixpkgs.lib.nixosSystem {
@@ -40,15 +53,21 @@
         };
       };
 
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          # The Nix packages provided in the environment
-          # Add any you need here
-          packages = with pkgs; [ pkgs.disko nixos-anywhere ];
+      devShells = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            # The Nix packages provided in the environment
+            # Add any you need here
+            packages = with pkgs; [
+              pkgs.disko
+              nixos-anywhere
+            ];
 
-          # Add any shell logic you want executed any time the environment is activated
-          shellHook = '''';
-        };
-      });
+            # Add any shell logic you want executed any time the environment is activated
+            shellHook = '''';
+          };
+        }
+      );
     };
 }