Fix compilation on latest nightly because of stdsimd (#3296)

We need to bump `ahash` to make it compile again.

Closes: https://github.com/paritytech/polkadot-sdk/issues/3269

substrate/bin/node-template/env-setup/.envrc

@@ -0,0 +1 @@
+use flake

substrate/bin/node-template/env-setup/README.md

@@ -0,0 +1,9 @@
+# Env setup
+
+Special files for setting up an environment to work with the template:
+
+- `rust-toolchain.toml` when working with `rustup`.
+- `flake.nix` when working with `nix`.
+
+These files will be copied by the installer script to the main directory. They are
+put into this special directory to not interfere with the normal CI.

substrate/bin/node-template/env-setup/flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1678901627,
+        "narHash": "sha256-U02riOqrKKzwjsxc/400XnElV+UtPUQWpANPlyazjH0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "93a2b84fc4b70d9e089d029deacc3583435c2ed6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1679262748,
+        "narHash": "sha256-DQCrrAFrkxijC6haUzOC5ZoFqpcv/tg2WxnyW3np1Cc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "60c1d71f2ba4c80178ec84523c2ca0801522e0a6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

substrate/bin/node-template/env-setup/flake.nix

@@ -0,0 +1,22 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        packages = with pkgs; [
+          rustup
+          clang
+          protobuf
+        ];
+
+        LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+      };
+    });
+}

substrate/bin/node-template/env-setup/rust-toolchain.toml

@@ -0,0 +1,14 @@
+[toolchain]
+channel = "stable"
+components = [
+	"cargo",
+	"clippy",
+	"rust-analyzer",
+	"rust-src",
+	"rust-std",
+	"rustc",
+	"rustc-dev",
+	"rustfmt",
+]
+targets = ["wasm32-unknown-unknown"]
+profile = "minimal"