CI: add the grabpl build-backend command into the repo (#52673)

* Move the grabpl build-backend command and clean it up a bit

pkg/build/cmd/argcount_wrapper.go

@@ -0,0 +1,16 @@
+package main
+
+import "github.com/urfave/cli/v2"
+
+func ArgCountWrapper(max int, action cli.ActionFunc) cli.ActionFunc {
+	return func(ctx *cli.Context) error {
+		if ctx.NArg() > max {
+			if err := cli.ShowSubcommandHelp(ctx); err != nil {
+				return cli.Exit(err.Error(), 1)
+			}
+			return cli.Exit("", 1)
+		}
+
+		return action(ctx)
+	}
+}