add crtui

pkgs/crtui.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  stdenv,
+  fetchzip,
+}:
+let
+  version = "0.4.1";
+  plat = {
+    "aarch64-darwin" = "darwin_arm64";
+    "x86_64-darwin" = "darwin_amd64";
+    "aarch64-linux" = "linux_arm64";
+    "x86_64-linux" = "linux_amd64";
+  };
+in
+stdenv.mkDerivation {
+  pname = "crtui";
+  inherit version;
+
+  src = fetchzip {
+    url = "https://github.com/ksckaan1/crtui/releases/download/v${version}/crtui_${version}_${
+      plat.${stdenv.hostPlatform.system}
+        or (throw "crtui: unsupported platform ${stdenv.hostPlatform.system}")
+    }.tar.gz";
+    hash = "sha256-Rue9l2dZR8J6+XCV4HGOvYywklDa9jq4I6IUlhmtTF8=";
+    stripRoot = false; # tarball has no single top-level dir
+  };
+
+  # Prebuilt binary: skip fixup so llvm-strip does not invalidate the
+  # ad-hoc Mach-O signature macOS arm64 requires.
+  dontFixup = true;
+
+  installPhase = ''
+    runHook preInstall
+    install -Dm755 $src/crtui $out/bin/crtui
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Terminal-based container registry management tool";
+    homepage = "https://github.com/ksckaan1/crtui";
+    license = lib.licenses.mit;
+    mainProgram = "crtui";
+    platforms = builtins.attrNames plat;
+  };
+}