orbstack: Adds shell completions to orbstack package (#485447)

pkgs/by-name/or/orbstack/package.nix

@@ -3,6 +3,7 @@
   stdenvNoCC,
   fetchurl,
   _7zz,
+  installShellFiles,
 }:
 let
   inherit (stdenvNoCC.hostPlatform) system;
@@ -41,7 +42,10 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   # These bogus files corrupt the .app bundle and prevent it from launching.
   unpackCmd = "7zz x -snld -xr'!*:com.apple.*' $curSrc";
 
-  nativeBuildInputs = [ _7zz ];
+  nativeBuildInputs = [
+    _7zz
+    installShellFiles
+  ];
 
   sourceRoot = ".";
 
@@ -59,6 +63,12 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
+  postInstall = ''
+    installShellCompletion --bash "$out"/Applications/OrbStack.app/Contents/Resources/completions/bash/{docker,kubectl,orbctl}.bash
+    installShellCompletion --zsh "$out"/Applications/OrbStack.app/Contents/Resources/completions/zsh/{_docker,_kubectl,_orb,_orbctl}
+    installShellCompletion --fish "$out"/Applications/OrbStack.app/Contents/Resources/completions/fish/{docker,kubectl,orbctl}.fish
+  '';
+
   passthru = {
     inherit sources;
     updateScript = ./update.sh;