Steps to Reproduce: Run several times without success (with both 1.33 and 1.34 bundle)
```
docker-compose docker-compose.yml pull
docker-compose docker-compose.yml up
```
(docker-compose.yml downloaded [[ https://github.com/wmde/wikibase-docker/blob/master/docker-compose.yml | here ]]
after removing everything of all my former Docker contains and volumes with
```
docker system prune
```.
Actual Results:
When I try to access mywiki.org or mywiki.org:8181, I see this warning (also visible in the logs related to the //wikibase //container):
>> Warning: require_once(/var/www/html/extensions/Wikibase/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/LocalSettings.php on line 52
>>
>> Fatal error: require_once(): Failed opening required '/var/www/html/extensions/Wikibase/vendor/autoload.php' (include_path='/var/www/html/vendor/pear/console_getopt:/var/www/html/vendor/pear/mail:/var/www/html/vendor/pear/mail_mime:/var/www/html/vendor/pear/net_smtp:/var/www/html/vendor/pear/net_socket:/var/www/html/vendor/pear/pear-core-minimal/src:/var/www/html/vendor/pear/pear_exception:.:/usr/local/lib/php') in /var/www/html/LocalSettings.php on line 52
>
Based on [[ https://phabricator.wikimedia.org/T201615 | this ]], I've tried to add "extensions/Wikibase/composer.json" in composer.local.json without success.
Expected Results: to be able to run again a Wikibase instance...