nix: add router to the devshell

flake.nix

@@ -70,6 +70,10 @@
                 torch
                 transformers
                 vllm
+
+                (callPackage ./router.nix {
+                  inherit (rustPlatform) buildRustPackage importCargoLock;
+                })
               ]);
 
             venvDir = "./.venv";

router.nix

@@ -0,0 +1,18 @@
+{ buildRustPackage, importCargoLock, pkg-config, protobuf, openssl }:
+
+buildRustPackage {
+  name = "text-generation-router";
+
+  src = ./.;
+
+  sourceDir = ./backends/v3;
+
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ openssl.dev protobuf ];
+
+}