The issue is described in
rubygems/rubygems#8477

The issue fails the workflow whenever RDoc's version is bumped as there
will then be a mismatch between the target file name and the version
that's actually built.

For example:

```
rdoc 6.13.0 built to pkg/rdoc-6.12.0.gem.
```

This commit works around the issue by manually building the gem and
installing it locally so the latest installed version will match the
version contained in the gemspec file.

---------

Co-authored-by: Sutou Kouhei <kou@clear-code.com>

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.222.0
to 1.227.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/setup-ruby/releases">ruby/setup-ruby's
releases</a>.</em></p>
<blockquote>
<h2>v1.227.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Add truffleruby-24.2.0,truffleruby+graalvm-24.2.0 by <a
href="https://github.com/ruby-builder-bot"><code>@​ruby-builder-bot</code></a>
in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/724">ruby/setup-ruby#724</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.226.0...v1.227.0">https://github.com/ruby/setup-ruby/compare/v1.226.0...v1.227.0</a></p>
<h2>v1.226.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Use $JAVA_HOME/bin/java for the check by <a
href="https://github.com/eregon"><code>@​eregon</code></a> in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/723">ruby/setup-ruby#723</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.225.0...v1.226.0">https://github.com/ruby/setup-ruby/compare/v1.225.0...v1.226.0</a></p>
<h2>v1.225.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Switch JAVA_HOME to 21 for JRuby by <a
href="https://github.com/headius"><code>@​headius</code></a> in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/721">ruby/setup-ruby#721</a></li>
<li>Handle exec error by <a
href="https://github.com/headius"><code>@​headius</code></a> in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/722">ruby/setup-ruby#722</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.224.0...v1.225.0">https://github.com/ruby/setup-ruby/compare/v1.224.0...v1.225.0</a></p>
<h2>v1.224.0</h2>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.223.0...v1.224.0">https://github.com/ruby/setup-ruby/compare/v1.223.0...v1.224.0</a></p>
<h2>v1.223.0</h2>
<h2>What's Changed</h2>
<ul>
<li>bugfix: Fix bug that version cannot be parsed in .tool-versions by
<a href="https://github.com/Karibash"><code>@​Karibash</code></a> in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/720">ruby/setup-ruby#720</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/Karibash"><code>@​Karibash</code></a>
made their first contribution in <a
href="https://redirect.github.com/ruby/setup-ruby/pull/720">ruby/setup-ruby#720</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/setup-ruby/compare/v1.222.0...v1.223.0">https://github.com/ruby/setup-ruby/compare/v1.222.0...v1.223.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/setup-ruby/commit/1a615958ad9d422dd932dc1d5823942ee002799f"><code>1a61595</code></a>
Add truffleruby-24.2.0,truffleruby+graalvm-24.2.0</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/922ebc4c5262cd14e07bb0e1db020984b6c064fe"><code>922ebc4</code></a>
Use $JAVA_HOME/bin/java for the check</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/6c79f721fa26dd64559c2700086ac852c18e0756"><code>6c79f72</code></a>
Test successful JRuby start without using launcher</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/e17c5ea7ebdf9f04d606b35ba0e8fb133e26d624"><code>e17c5ea</code></a>
Handle exec error</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/f0a4d6bddd8e71bd3268c611f7ea6f41dce6d7fd"><code>f0a4d6b</code></a>
Switch JAVA_HOME to 21 for JRuby (<a
href="https://redirect.github.com/ruby/setup-ruby/issues/721">#721</a>)</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/bbda85882f33075a3727c01e3c8d0de0be6146ce"><code>bbda858</code></a>
Fix .tool-versions and mise.toml tests</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/30755d8bf4ebfa38caa5ad3a6b808846393196a5"><code>30755d8</code></a>
Cleanup matching for .tool-versions and mise and add tests for
.ruby-version ...</li>
<li><a
href="https://github.com/ruby/setup-ruby/commit/28233a011b6bb8633ea908d76c6d23aab6518b5c"><code>28233a0</code></a>
bugfix: Fix bug that version cannot be parsed in .tool-versions</li>
<li>See full diff in <a
href="https://github.com/ruby/setup-ruby/compare/277ba2a127aba66d45bad0fa2dc56f80dbfedffa...1a615958ad9d422dd932dc1d5823942ee002799f">compare
view</a></li>
</ul>
</details>
<br />


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The parent class, RDoc::TestCase, already has RDoc::Options. We can use
it instead of creating a new one.

In #1304, I removed the ability to set
path prefix through patching Darkfish generator. But it turns out that
it's used in `sdoc`.

See #1304 (comment)

But the original implementation was brittle and confusing. So instead of
just restoring it, I think allowing the customization through options is
a better approach.

Diff: v6.13.0...master

I consider #1330 a fix too because the new options are introduced as an
better alternative for a accidental breaking change.