Check Rails.env for current environment when ENV vars weren't set

[stiig]

What is the purpose of this pull request?

During migrations without setting RAILS_ENV or RACK_ENV rails behaves like running in development environment but anyway_config doesn't reflect this

What changes did you make? (overview)

Add safe checking Rails.env

Is there anything you'd like reviewers to focus on?

Checklist

• [ ] I've added tests for this change
• [ ] I've added a Changelog entry
• [ ] I've updated a documentation

[palkan]

Thanks!