Fix dns resolution when a backend container restarts

[PipeItToDevNull]

Nginx caches the resolution of the backend when it starts, you must specify a resolver to update the cached IP without having to restart

[deepsource-io]

Here's the code health analysis summary for commits 5848aab..27d1687. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success	🎯 2 occurences resolved	View Check ↗
Docker	✅ Success		View Check ↗

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