I got it working by going into the container and doing:
bundle install --with migrations
The problem is that the rake task rake ai:embeddings:backfill
does this:
Parallel.each(topics.all, in_processes: args[:concurrency].to_i, progress: "Topics") do |t|
ActiveRecord::Base.connection_pool.with_connection do
vector_rep.generate_representation_from(t)
end
end
which needs to have ruby-progressbar
loaded, but it is ignored because its in the Gemfile migrations group.