Run system tests on CI

Author: amatsuda

.github/workflows/rails.yml

@@ -38,7 +38,7 @@ jobs:
         run: bin/rails db:schema:load
       # Add or replace test runners here
       - name: Run tests
-        run: bin/rake
+        run: bin/rails test:system test
 
   lint:
     runs-on: ubuntu-latest