feat: add templates

template/rust/flake.nix

@@ -0,0 +1,34 @@
+{
+  description = "";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+    util = {
+      url = "github:hectic-lab/util.nix?ref=fix/postgres-extension";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, util }:
+  let
+    overlays = [ (import rust-overlay) util.overlays.default ];
+  in
+  util.lib.forAllSystemsWithPkgs overlays ({ system, pkgs }:
+    let
+      lib = pkgs.lib;
+    in
+    {
+      ### DEV SHELL ###
+      devShells.${system} = {
+	default = import ./devshell/default.nix { inherit pkgs; };
+      };
+    }
+  );
+}