DNS lookups on containers can be throttled

Problem/Motivation

This should probably be in drupalci_environments but for now this is a placeholder - see #3045612-61: Random test failure in MediaStandardProfileTest::testMediaSources →

Steps to reproduce

Proposed resolution

Implement a DNS server that caches and use it in on the containers as per https://faun.pub/fixing-dns-timeouts-in-docker-with-a-dns-cache-976d9092...

Remaining tasks

Decide if bullseye docker images still need this change because it using systemd for dns resolution systemd-resolved

User interface changes

API changes

Data model changes