add dev shell flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1730327045,
+        "narHash": "sha256-xKel5kd1AbExymxoIfQ7pgcX6hjw9jCgbiBjiUfSVJ8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "080166c15633801df010977d9d7474b4a6c549d7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,25 @@
+{
+  description = "Dev shell flake for servicepoint-tanks";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-24.05";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      lib = nixpkgs.lib;
+      forAllSystems = lib.genAttrs lib.systems.flakeExposed;
+    in
+    {
+      devShells = forAllSystems (system: {
+        default = import ./shell.nix {
+          inherit nixpkgs;
+          pkgs = nixpkgs.legacyPackages."${system}";
+          lib = nixpkgs.lib;
+        };
+      });
+
+      formatter = forAllSystems (system: nixpkgs.legacyPackages."${system}".nixfmt-rfc-style);
+    };
+}

shell.nix

@@ -1,5 +1,6 @@
 {
   pkgs ? import <nixpkgs> { },
+  ...
 }:
 let
   rust-toolchain = pkgs.symlinkJoin {