Show hook-output by default

Previously hooks could write to stdout, but this wouldn't be visible
unless `-v` was passed to increase the verbosity

lib/kamal/cli/base.rb

@@ -137,7 +137,9 @@ def run_hook(hook, **extra_details)
           say "Running the #{hook} hook...", :magenta
           with_env KAMAL.hook.env(**details, **extra_details) do
             run_locally do
-              execute *KAMAL.hook.run(hook)
+              KAMAL.with_verbosity(:debug) do
+                execute *KAMAL.hook.run(hook)
+              end
             end
           rescue SSHKit::Command::Failed => e
             raise HookError.new("Hook `#{hook}` failed:\n#{e.message}")