sean Yeah, that's where I encountered problems.
Trying to run the first bundle install gave me an error that it couldn't proceed because the Gemlock file expected a newer version of bundler, and in turn recommended running gem install bundler -v '~> 2.6' before bundle install.
Trying to do that returned a different error saying that it couldn't install that bundler version because the Ruby version was too old—even though I'd previously ran source scl_source enable devtoolset-11 ruby32 nodejs20, which ought to have updated it, I figure?