kubecm: installShellCompletion (#398508)

pkgs/by-name/ku/kubecm/package.nix

@@ -2,6 +2,8 @@
   lib,
   buildGoModule,
   fetchFromGitHub,
+  installShellFiles,
+  stdenv,
 }:
 
 buildGoModule rec {
@@ -22,13 +24,25 @@ buildGoModule rec {
     "-X github.com/sunny0826/kubecm/version.Version=${version}"
   ];
 
+  nativeBuildInputs = [ installShellFiles ];
+
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd kubecm \
+      --bash <($out/bin/kubecm completion bash) \
+      --fish <($out/bin/kubecm completion fish) \
+      --zsh <($out/bin/kubecm completion zsh)
+  '';
+
   doCheck = false;
 
   meta = with lib; {
     description = "Manage your kubeconfig more easily";
     homepage = "https://github.com/sunny0826/kubecm/";
     license = licenses.asl20;
-    maintainers = with maintainers; [ qjoly ];
+    maintainers = with maintainers; [
+      qjoly
+      sailord
+    ];
     mainProgram = "kubecm";
   };
 }