**Feature summary** (what you would like to be able to do and where):
Currently it is not possible to to install MediaWiki with an existing LocalSettings.php file. If you include a LocalSettings.php with your current MediaWiki installation and open MediaWiki the first time with an empty database, you will run into database errors. If you try to run `install.php`, you will run into `A LocalSettings.php file has been detected. To upgrade this installation, please run update.php instead`. Trying `update.php` fails as well.
**Use case(s)** (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
A containerized/exportable version of MediaWiki that can utilize an existing LocalSettings.php and does not have to go through the install process every time when recreated.
**Benefits** (why should this be implemented?):
Ease of testing and reproducing production MediaWikis.