Add Rakefile to fix release workflow (#426)

The `rubygems/release-gem@v1` action expects `rake release` to be
available, which requires bundler gem tasks. This was causing the
release workflow to fail with "No Rakefile found".

Also removes the redundant `gem build` step since `rake release`
handles both building and pushing the gem.

Co-authored-by: Garen J. Torikian <[email protected]>
Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: 3 people

.github/workflows/release.yml

@@ -63,8 +63,5 @@ jobs:
       - name: Run tests
         run: bundle exec rspec
 
-      - name: Build gem
-        run: gem build workos.gemspec
-
       - name: Publish to RubyGems
         uses: rubygems/release-gem@v1

Rakefile

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new(:spec)
+
+task default: :spec