[Do not merge] Run tests with --enable=frozen-string-literal

Author: github-actions

.github/workflows/main.yml

@@ -8,6 +8,9 @@ on:
       - master
       - spec_live
 
+env:
+  RUBYOPT: --enable=frozen-string-literal
+
 jobs:
   test-and-lint:
     name: Test and lint
@@ -55,4 +58,4 @@ jobs:
           bundle install
           bundle exec rake clean_live set_ci_credentials spec:live ||
           bundle exec rake clean_live &&
-          bundle exec rspec spec/live --only-failures
+          bundle exec rspec spec/live --only-failures