kops: add bash and zsh completions

Closes #20601.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/kops.rb

@@ -27,6 +27,14 @@ class Kops < Formula
     kopspath.install Dir["*"]
     system "make", "-C", kopspath
     bin.install("bin/kops")
+
+    # Install bash completion
+    output = Utils.popen_read("#{bin}/kops completion bash")
+    (bash_completion/"kops").write output
+
+    # Install zsh completion
+    output = Utils.popen_read("#{bin}/kops completion zsh")
+    (zsh_completion/"_kops").write output
   end
 
   test do