The appwrite container's `dns: 172.16.238.100` (CoreDNS) bypassed Docker's
embedded DNS, preventing resolution of service names like `postgresql`.
CoreDNS only handles custom test domains and forwards unknown queries to
Cloudflare, which can't resolve Docker service names.
Fix: Add 127.0.0.11 (Docker embedded DNS) as primary resolver and configure
CoreDNS to forward unknown queries to Docker DNS with Cloudflare as fallback.
Bind CoreDNS to its static IP to avoid port conflict with Docker's DNS proxy.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Jake Barnby
Hemachandar