fix: fix github action

Author: haruyama.makoto

.github/workflows/ruby.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0']
+        ruby-version: ['2.5', '2.6', '2.7', '3.0']
 
     steps:
     - uses: actions/checkout@v2
@@ -29,5 +29,7 @@ jobs:
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Install dependencies
       run: bundle install
+    - name: Compile
+      run: bundle exec rake compile
     - name: Run tests
       run: bundle exec rspec