/usr/lib/ruby/vendor_ruby/erubis/local-setting.rb is in ruby-erubis 2.7.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## $Release: 2.7.0 $
## copyright(c) 2006-2011 kuwata-lab.com all rights reserved.
##
##
## you can add site-local settings here.
## this files is required by erubis.rb
##
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