Tip: Stopping the "Access denied for user 'root'@'localhost' (using password: NO)" warnings in DB logs

While troubleshooting an issue I was having, I noticed a number of Issues here have the "Access denied for user 'root'@'localhost' (using password: NO)" warning in the database logs in common, and thought I'd offer this tip.

It's caused by the healthcheck test command in the database section.

By default it's set to: `test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]`

That command accepts `--password=` as a parameter, so you can modify the test to:
```
test: ["CMD", "mariadb-admin" ,"ping", "-h", "localhost", "--password="]
```

You should never see another healthcheck-related access denied warning.

Edit (2023-06-26): MariaDB seems to have recently removed/replaced the `mysqladmin` command with `mariadb-admin`. The latter provides the same functionality.

Locate the database healthcheck in the Docker Compose configuration and start from the command using mysqladmin. Compare it with the MariaDB command and password argument described here, then verify that the resulting healthcheck no longer produces the access-denied warning.

Written by the indexing model from the issue text.