feat: add rust template to new structure

templates/rust/.envrc

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+use flake

templates/rust/Cargo.toml

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+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

templates/rust/flake.nix

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+{
+  description = "Nix Flake Template for Rust using Fenix and Naersk";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    systems.url = "github:nix-systems/default";
+    naersk.url = "github:nix-community/naersk";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , naersk
+    , fenix
+    , systems
+    , ...
+    }:
+    let
+      forEachSystem = nixpkgs.lib.genAttrs (import systems);
+      pkgsFor = forEachSystem (system:
+
+        import nixpkgs {
+          inherit system;
+          overlays = [
+            fenix.overlays.default
+          ];
+        });
+      rust-toolchain = forEachSystem (system: pkgsFor.${system}.fenix.stable);
+    in
+    {
+      formatter = forEachSystem (system: pkgsFor.${system}.nixpkgs-fmt);
+
+      devShells = forEachSystem (system: {
+        default = pkgsFor.${system}.mkShell {
+          packages = with rust-toolchain.${system}; [
+            cargo
+            rustc
+            clippy
+            rustfmt
+            rust-analyzer
+          ];
+          env = {
+            RUST_BACKTRACE = "full";
+          };
+          RUST_SRC_PATH = "${rust-toolchain.${system}.rust-src}/lib/rustlib/src/rust/library";
+        };
+      });
+
+      packages = forEachSystem (system: {
+        default =
+          (pkgsFor.${system}.callPackage naersk {
+            inherit (rust-toolchain.${system}) cargo rustc;
+          }).buildPackage {
+            src = ./.;
+          };
+      });
+
+      apps = forEachSystem (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/rust";
+        };
+      });
+    };
+}

templates/rust/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}