[ruby 3.0 + bundler] rexml not found

[jordansissel]

/home/jls/projects/fpm/lib/fpm/package/osxpkg.rb:7:in `require': cannot load such file -- rexml/document (LoadError)

This seems to be due to the fact that rexml was moved from a "standard" gem (in ruby 2.x) to a "bundled" gem (in ruby 3.x).

A fix for this is to add rexml as a dependency in the gemspec.

[jordansissel]

Test cases for this:

Fails on 3.0.1 w/ bundler

% (rbenv shell 3.0.1; bundle install; bundle exec bin/fpm -s empty -t empty -n example)
...
/home/jls/projects/fpm/lib/fpm/package/osxpkg.rb:7:in `require': cannot load such file -- rexml/document (LoadError)

Working on 2.7.0 w/ bundler

% (rbenv shell 2.7.0; bundle install; bundle exec bin/fpm -s empty -t empty -n example)
Your package has gone into the void. {:level=>:warn}
Created package {:path=>""}