chore: copy nixfile instead of git submodules

Author: malhussan

.gitmodules

@@ -135,8 +135,6 @@ Before opening a Pull Request, please do the following:
 
 2. Execute `pre-commit install`: Hooks configured in `.pre-commit-config.yaml` will be executed automatically on commit. For manual execution, you can use `pre-commit run -a`.
 
-To update git submodules, execute `git submodule foreach git pull`.
-
 <!-- BEGIN_TF_DOCS -->
 ## Requirements
 

README.md

@@ -0,0 +1,39 @@
+{ pkgs ? import <nixpkgs> { }, system ? builtins.currentSystem }:
+
+let
+  # fake opentofu as terraform so that tools like terraform-docs pre-commit hook (which doesn't have tofu support)
+  # fall back to tofu
+  tofu_terraform =
+    pkgs.stdenv.mkDerivation {
+      name = "tofu-terraform";
+      phases = [ "installPhase" ];
+      installPhase = ''
+        mkdir -p $out/bin
+        echo '#!/usr/bin/env sh' > $out/bin/terraform
+        echo 'tofu $@' > $out/bin/terraform
+        chmod +x $out/bin/terraform
+      '';
+    };
+
+in
+
+pkgs.mkShell {
+  NIX_SHELL = "terraform-meshplatform-modules";
+  shellHook = ''
+    echo starting terraform-meshplatform-modules shell
+    terraform -v
+    tofu -v
+    terraform-docs -v
+    pre-commit --version
+  '';
+
+  buildInputs = [
+    pkgs.pre-commit
+    pkgs.opentofu
+    pkgs.tflint
+    pkgs.terraform-docs
+
+    # fake tofu as terraform
+    tofu_terraform
+  ];
+}