Unable to use database_socket in docker

I'm using an external mariadb and trying to mount its socket file into docker.
I found there is a `database_socket` parameter in https://doc.wallabag.org/en/admin/parameters.html#database-parameters.
But when I try to add environment: SYMFONY__ENV__DATABASE_SOCKET=/var/run/mysqld/mysqld.sock, the container just stucks in `Waiting for database ...` which refers to https://github.com/wallabag/docker/blob/41430135535d5ee5a7fc1fbbda90323331827eb5/root/entrypoint.sh#L32-L34 and https://github.com/wallabag/docker/blob/41430135535d5ee5a7fc1fbbda90323331827eb5/root/entrypoint.sh#L10-L17.
It seems that the container will always wait for DATABASE_HOST@DATABASE_PORT even if we provide a DATABASE_SOCKET?
I tried to delete that `wait_for_database`, which results in `SQLSTATE[HY000] [2002] Connection refused`:
```
wallabag | Starting wallabag ...
wallabag | Installing dependencies from lock file
wallabag | Verifying lock file contents can be installed on current platform.
wallabag | Nothing to install, update or remove
wallabag | Package guzzlehttp/ringphp is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package guzzlehttp/streams is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/compiler is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/consistency is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/event is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/exception is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/file is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/iterator is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/math is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/protocol is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/regex is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/ruler is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/stream is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/ustring is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/visitor is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package hoa/zformat is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package lexik/form-filter-bundle is abandoned, you should avoid using it. Use spiriitlabs/form-filter-bundle instead.
wallabag | Package php-http/guzzle5-adapter is abandoned, you should avoid using it. Use php-http/guzzle7-adapter instead.
wallabag | Package php-http/message-factory is abandoned, you should avoid using it. Use psr/http-factory instead.
wallabag | Package scheb/2fa-qr-code is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package sensio/framework-extra-bundle is abandoned, you should avoid using it. Use Symfony instead.
wallabag | Package symfony/debug is abandoned, you should avoid using it. Use symfony/error-handler instead.
wallabag | Package symfony/inflector is abandoned, you should avoid using it. Use EnglishInflector from the String component instead.
wallabag | Package true/punycode is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package wallabag/php-mobi is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package php-cs-fixer/diff is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Package symfony/web-server-bundle is abandoned, you should avoid using it. No replacement was suggested.
wallabag | Generating optimized autoload files
wallabag | Class SimpleHtmlDom\simple_html_dom_node located in ./vendor/mgargano/simplehtmldom/src/simple_html_dom.php does not comply with psr-0 autoloading standard. Skipping.
wallabag | Class SimpleHtmlDom\simple_html_dom located in ./vendor/mgargano/simplehtmldom/src/simple_html_dom.php does not comply with psr-0 autoloading standard. Skipping.
wallabag | 100 packages you are using are looking for funding.
wallabag | Use the `composer fund` command to find out more!
wallabag | > Incenteev\ParameterHandler\ScriptHandler::buildParameters
wallabag | Updating the "app/config/parameters.yml" file
wallabag | > bin/console cache:clear --no-warmup
wallabag |
wallabag | In ExceptionConverter.php line 101:
wallabag |
wallabag | An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refu
wallabag | sed
wallabag |
wallabag |
wallabag | In Exception.php line 28:
wallabag |
wallabag | SQLSTATE[HY000] [2002] Connection refused
wallabag |
wallabag |
wallabag | In Driver.php line 34:
wallabag |
wallabag | SQLSTATE[HY000] [2002] Connection refused
wallabag |
wallabag |
wallabag | Script bin/console cache:clear --no-warmup handling the post-cmd event returned with error code 255
wallabag | Script @post-cmd was called via post-install-cmd
wallabag exited with code 0
```
Here's the socket file:
```
# ls -l /var/run/mysqld/mysqld.sock
srwxrwxrwx 1 mysql mysql 0 Jun 7 15:41 /var/run/mysqld/mysqld.sock
```

I'm not familiar with php or pdo, how can I fix that?

I'm using docker compose with image `ghcr.io/wallabag/docker:2.6.9`:
```docker-compose
services:
wallabag:
image: ghcr.io/wallabag/docker:latest
environment:
- SYMFONY__ENV__DATABASE_DRIVER=pdo_mysql
- SYMFONY__ENV__DATABASE_NAME=wallabag
- SYMFONY__ENV__DATABASE_USER=wallabag
- SYMFONY__ENV__DATABASE_PASSWORD=...
- SYMFONY__ENV__DATABASE_SOCKET=/var/run/mysqld/mysqld.sock
- SYMFONY__ENV__DATABASE_CHARSET=utf8mb4
- SYMFONY__ENV__DATABASE_TABLE_PREFIX="wallabag_"
volumes:
- /var/run/mysqld/mysqld.sock:/var/run/mysqld/mysqld.sock:rwx
```