add nvs overlay

overlay.nix

@@ -0,0 +1,27 @@
+final: prev: {
+  nvs = prev.buildGoModule rec {
+    pname = "nvs";
+    version = "1.10.5";
+
+    src = prev.fetchFromGitHub {
+      owner = "cupcakearmy";
+      repo = pname;
+      # tag = "v${version}";
+      rev = "1700f2751e969b77b7f7ab3cc16a4e0f3955ce14";
+      sha256 = "sha256-RScXYxkrfLJp1nAgN2YgSRC4mLGK4yXsYjGBrDR00b8=";
+    };
+
+    vendorHash = "sha256-l2FdnXA+vKVRekcIKt1R+MxppraTsmo0b/B7RNqnxjA=";
+
+    # Completions
+    nativeBuildInputs = [ prev.installShellFiles ];
+    postInstall = ''
+      export HOME=$TMPDIR
+      installShellCompletion --cmd nvs \
+        --bash <($out/bin/nvs completion bash) \
+        --fish <($out/bin/nvs completion fish) \
+        --zsh <($out/bin/nvs completion zsh)
+    '';
+
+  };
+}