add rust-flake template

flake.nix

@@ -7,6 +7,10 @@
         path = ./base-flake;
         description = "An empty flake for each default system";
       };
+      rust-flake = {
+        path = ./rust-flake;
+        description = "Flake to develop, build and run a rust application";
+      };
     };
     defaultTemplate = self.templates.base-flake;
   };

rust-flake/.envrc

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

rust-flake/flake.nix

@@ -0,0 +1,31 @@
+{
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
+    utils.url = github:numtide/flake-utils;
+  };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        cargoToml = with builtins; (fromTOML (readFile ./dexios/Cargo.toml));
+      in
+      {
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          inherit (cargoToml.package) name version;
+          src = nixpkgs.lib.cleanSource ./.;
+          doCheck = true;
+          cargoLock.lockFile = ./Cargo.lock;
+        };
+
+        apps.default = utils.lib.mkApp {
+          inherit (cargoToml.package) name;
+          drv = packages.default;
+        };
+
+        devShell = with pkgs; mkShell {
+          packages = [ cargo rustc rustfmt clippy rust-analyzer ];
+          RUST_SRC_PATH = rustPlatform.rustLibSrc;
+        };
+      });
+}