Problem/Motivation
When you try to install Drupal from CLI with Drush and you have an issue related to the DB or DB configuration instead of the proper errors you will see Database: Array
This is only happens when you already have settings.php provisioned and configured.
The reason of this is SiteSettingsForm::getDatabaseErrorsTemplate() - it formats error list with Twig inline_template which is suitable for the installer form context but not for CLI/Drush.
Steps to reproduce
Copy default.settings.php into settings.php
Fill access details for the DB, but make a typo in the user/pass
Run drush site:install
Proposed resolution
Modify getDatabaseErrorsTemplate() of the core/lib/Drupal/Core/Installer/Form/SiteSettingsForm.php in a way that will allow errors to be visible in both installer UI and Drush.
Remaining tasks
Agree approach
Patch
Review
Manual testing
Commit
User interface changes
none
API changes
None
Data model changes
None
Release notes snippet
TDB