Add bundle lock to test job

Run bundle lock --add-platform before bundle install to resolve any
missing gems in the lockfiles.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

.github/workflows/ruby.yml

@@ -114,7 +114,7 @@ jobs:
         path: test/dummy/vendor/bundle
         key: dummy-app-gem-cache-${{ matrix.ruby }}-${{ hashFiles(format('{0}/gemfiles/{1}.gemfile.lock', github.workspace, matrix.gemfile)) }}
     - name: Install Ruby Gems for dummy app
-      run: bundle check --path=test/dummy/vendor/bundle || bundle _2.4.9_ install --frozen --path=test/dummy/vendor/bundle --jobs=4 --retry=3
+      run: bundle lock --add-platform 'x86_64-linux' && bundle check --path=test/dummy/vendor/bundle || bundle _2.4.9_ install --frozen --path=test/dummy/vendor/bundle --jobs=4 --retry=3
     - run: cd test/dummy && yalc add react_ujs && ${{ matrix.js_package_manager.installer }} install
     - run: bundle exec rake test
       env: