add missing bits to docker example config

[dakkar]

the most useful is the meilisearch/scope, because when that's missing, nothing gets indexed!

thanks to projectmoon for noticing

Checklist

• [x] Read the contribution guide
• [ ] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests