Initialization completely clears /var/www/html directory #1050

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Steps to reproduce

1. Create some test files and folders in a (otherwise empty) directory
2. Setup Nextcloud using the 17.0.5-apache Docker image, mounting the mentioned directory as /var/www/html/
3. Start the docker image

Expected behaviour

Existing files that don't belong to a Nextcloud installation are left intact.

Actual behaviour

The directory is cleared completely, including all files and directories within.

This is fatal when you accidentally mount a wrong path as /var/www/html/. In my case, I accidentally mounted /docker instead of /docker/nextcloud, and thus lost all my docker container data.

Server configuration

17.0.5-apache docker image from Docker Hub.

Logs

22:13:47 Initializing nextcloud 17.0.5.0 ...
22:15:03 Initializing finished
22:15:03 New nextcloud instance