Generator fails when BUNDLE_PATH is set

[jcoyne]

If you do:

BUNDLE_PATH="/usr/local/bundle" rails generate blacklight:install

It fails when it gets to the assets installer:

21.79     generate  blacklight:assets
21.79        rails  generate blacklight:assets
21.86 /usr/local/lib/ruby/3.3.0/bundler/definition.rb:594:in `materialize': Could not find solr_wrapper-4.0.2, rsolr-2.6.0, http-5.2.0, minitar-1.0.1, retriable-3.1.2, ruby-progressbar-1.13.0, http-cookie-1.0.7, http-form_data-2.3.0, llhttp-ffi-0.5.0, domain_name-0.6.20240107, ffi-compiler-1.3.2 in locally installed gems (Bundler::GemNotFound)

This is due to our use of Bundler.with_unbundled_env. I'm not sure if there's a reason we want this in generators.