upgrade truffleruby to 19.2.0; enable in nightly job (PR #3305)

* upgrade truffleruby to 19.2.0
* run TruffleRuby only when the build was triggered by cron
* use Haml version 4 when running on TruffleRuby (because version 5 is using Ripper which is unsupported)

1 files changed, 4 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index ecffc678..62ccf926 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,3 +25,7 @@ end
 group :ci do
   gem 'simplecov', '~> 0.16.0'
 end
+
+if RUBY_ENGINE == 'truffleruby'
+  gem 'haml', '~> 4.0'
+end