Reduce gem size by excluding test files

[yuri-zubov]

This pull request updates the *.gemspec file to optimize the gem package size and structure

$ gem build -o before.tar

$ git switch reduce-gem-size

$ gem build -o after.tar

$ du -sh before.tar after.tar
 28K	before.tar
 16K	after.tar

Metric	Before	After	Saved
Size	28K	16K	−20K (⏷ −45.5%)

whitch files was deleted?

data
-├── .github
-│   └── workflows
-│       └── ci.yaml
-├── examples
-│   ├── a_basic_example.rb
-│   ├── alt_names.rb
-│   ├── banners1.rb
-│   ├── banners2.rb
-│   ├── banners3.rb
-│   ├── boolean.rb
-│   ├── constraints.rb
-│   ├── didyoumean.rb
-│   ├── medium_example.rb
-│   ├── partialmatch.rb
-│   ├── permitted.rb
-│   └── types_custom.rb
 ├── lib
 │   └── optimist.rb
-├── test
-│   ├── optimist
-│   │   ├── alt_names_test.rb
-│   │   ├── command_line_error_test.rb
-│   │   ├── help_needed_test.rb
-│   │   ├── parser_constraint_test.rb
-│   │   ├── parser_educate_test.rb
-│   │   ├── parser_opt_test.rb
-│   │   ├── parser_parse_test.rb
-│   │   ├── parser_permitted_test.rb
-│   │   ├── parser_test.rb
-│   │   └── version_needed_test.rb
-│   ├── support
-│   │   └── assert_helpers.rb
-│   ├── optimist_test.rb
-│   └── test_helper.rb
-├── .gitignore
-├── .rubocop_local.yml
-├── .rubocop.yml
-├── .whitesource
 ├── CHANGELOG.md
-├── FAQ.txt
-├── Gemfile
 ├── LICENSE.txt
-├── optimist.gemspec
-├── Rakefile
 ├── README.md
-└── renovate.json

ps: you can see on rails repo

[yuri-zubov]

The test_files directive is no longer used by RubyGems.org.

[kbrock]

We have no tests or exe. It is boilerplate. Assuming we will not have new lines in our file names, so while that change is not necessary, looks good

[Fryguy]

is the gemspec required to be part of the package? I feel like we should include that one too.

[Fryguy]

EDIT: Oh I see in your actioncable example there they don't have it - that works for me 👍