test-bot: build bottle with verbose

It will print out what stops bottle being relocatable.

Closes Homebrew/homebrew#41958.

Signed-off-by: Xu Cheng <xucheng@me.com>

Library/Homebrew/cmd/test-bot.rb

@@ -508,7 +508,7 @@ module Homebrew
       test "brew", "audit", *audit_args
       if install_passed
         if formula.stable? && !ARGV.include?('--no-bottle')
-          bottle_args = ["--rb", canonical_formula_name]
+          bottle_args = ["--verbose", "--rb", canonical_formula_name]
           bottle_args << { :puts_output_on_success => true }
           test "brew", "bottle", *bottle_args
           bottle_step = steps.last