* Add climate_control gem and test helper
* Replace ENV mods in upgrades test
* Replace ENV mods in registrations test
* Remove ENV references in hostings controller
* Update ENV refs in mailer test
* ActiveStorage cleanup
* Consolidate queue config so appropriate adapter runs in test environment
* Make test environment more explicit
* Centralize self hosting config
* Remove flaky system test
* Add setting fields to model
* Allow to configure SMTP settings
* Normalize locales
* Cleanup locales
* Remove 'coming soon'
* fix test
* Reset credentials
* Reset development config
* Check smtp spelling
* Use post instead of get method
* TLS ENV variable is more descriptive
* Rework application mailer
* Follow rails convention for mailer action params
* Reset schema.rb to main
* Test WIP
* Add test for controller and mailer
* Move tests from controller to model
* Custom error message if settings are not all present
* Comment smtp config in development env
* Add default tls enabled value
* Rubocop
* Fix controller test
* Reset credentials
* Normalize locales
* Test
* fix test
* Fix application mailer test that fails randomly
* Error flash message instead of notice
* Rework application mailer tests
