ruby.yml in cxml-ruby-0.6.1

- old
+ new

@@ -13,9 +13,10 @@
       uses: actions/setup-ruby@v1
       with:
         ruby-version: 2.6.x
     - name: Test with Rake
       run: |
+        sudo apt-get install libxml2-utils
         gem install bundler
         bundle install --jobs 4 --retry 3
         bundle exec rake
     - name: Check with Rubocop
       run: |