update flake, add overlay and nixosModule

flake.lock

@@ -1,17 +1,40 @@
 {
   "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "naersk",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1752475459,
+        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "naersk": {
       "inputs": {
+        "fenix": "fenix",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1752249768,
-        "narHash": "sha256-wKqMvhTqMgTKM/CdTH/ihq9eLZM95qpU0FG7cvTBFJg=",
+        "lastModified": 1752689277,
+        "narHash": "sha256-uldUBFkZe/E7qbvxa3mH1ItrWZyT6w1dBKJQF/3ZSsc=",
         "owner": "nix-community",
         "repo": "naersk",
-        "rev": "35aa63738857c40f98ecb04db52887d664836e74",
+        "rev": "0e72363d0938b0208d6c646d10649164c43f4d64",
         "type": "github"
       },
       "original": {
@@ -37,11 +60,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1752162966,
-        "narHash": "sha256-3MxxkU8ZXMHXcbFz7UE4M6qnIPTYGcE/7EMqlZNnVDE=",
+        "lastModified": 1757545623,
+        "narHash": "sha256-mCxPABZ6jRjUQx3bPP4vjA68ETbPLNz9V2pk9tO7pRQ=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "10e687235226880ed5e9f33f1ffa71fe60f2638a",
+        "rev": "8cd5ce828d5d1d16feff37340171a98fc3bf6526",
         "type": "github"
       },
       "original": {
@@ -57,6 +80,23 @@
         "nix-filter": "nix-filter",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -11,7 +11,7 @@
   };
 
   outputs =
-    inputs@{
+    {
       self,
       nixpkgs,
       naersk,
@@ -47,6 +47,14 @@
         }
       );
 
+      nixosModules.default = {
+        nixpkgs.overlays = [ self.overlays.servicepoint-packages ];
+      };
+
+      overlays.default = final: prev: {
+        servicepoint-simulator = self.legacyPackages."${prev.system}".servicepoint-simulator;
+      };
+
       legacyPackages = packages;
 
       devShells = forAllSystems (
@@ -80,6 +88,6 @@
         }
       );
 
-      formatter = forAllSystems ({ pkgs, ... }: pkgs.nixfmt-rfc-style);
+      formatter = forAllSystems ({ pkgs, ... }: pkgs.nixfmt-tree);
     };
 }