Setting up brand new istance using stock composer file with latest nextcloud image results in Internal Server Error shortly after pressing Install button.

No errors in containers log but inside NC one I can found following:

Failed to open stream: No such file or directory at /var/www/html/lib/private/Config.php

Anyway said file is there...

Quick workaround would be installing and upgrading previous minor release (29.0.4) but in that case one's facing a Connection refused error which requires editing mariadb container's default hostname (from container's one to host's one) so maybe would be better installing and upgrading previous major release (28.0.9) instead.