fix: attach to per-resource Coolify network, not the global one

Traefik in this Coolify install resolves backends on a per-resource
network named after the resource UUID, not the shared "coolify" network.
COOLIFY_RESOURCE_UUID is injected into the compose env by Coolify, so
naming the external network from it lets Traefik find couchdb.

docker-compose.yml

@@ -61,6 +61,7 @@ services:
 networks:
   coolify:
     external: true
+    name: ${COOLIFY_RESOURCE_UUID}
 
 volumes:
   couchdb_data: