In earlier versions of capistrano3-puma, the puma_bind has a default value to:
unix://.../tmp/sockets/puma.sock via set_if_empty in lib/capistrano/puma.rb.
This default was removed in 6.0.0, requiring to explicitly set :puma_bind in deploy.rb.
This caused the following runtime error during deploy:
> Failed to restart consul_puma_staging.service: Unit
> consul_puma_staging.socket has a bad unit file setting.
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