Support Sequel

[MarcPer]

Sequel is a widely used ORM alternative to ActiveRecord, and just as with ActiveRecord, it needs to be disconnected on before_fork if preload_app! is used.

For handling ActiveRecord, there's currently in puma.rb.erb:

before_fork do
  ActiveRecord::Base.connection_pool.disconnect!
end

For Sequel it would be like this:

before_fork do
  Sequel::Model.db.disconnect if defined?(Sequel::Model)
end

Could we include a setting puma_init_sequel in the spirit of puma_init_active_record and include the snippet above in the template?

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