Make repo a flake

flake.nix

@@ -0,0 +1,14 @@
+{
+  description = "Flake for EETQ kernels";
+
+  inputs = {
+    kernel-builder.url = "git+ssh://git@github.com/huggingface/kernel-builder";
+  };
+
+  outputs =
+    {
+      self,
+      kernel-builder,
+    }:
+    kernel-builder.lib.genFlakeOutputs ./.;
+}