[andreibondarev]

Summary

• docker-compose.yml: Milvus v2.4.5 → v3.0.3, matching the official v3.0.3 standalone compose file:
  • etcd v3.5.25
  • milvusdb/minio image
  • new milvus-volume-init service, because Milvus 3.0 runs as non-root
  • mc ready health check for MinIO
  • MINIO_REGION set
• Gemfile.lock: Faraday 2.7.10 → 2.8.1, the newest release that still supports Ruby 2.6/2.7 (2.9+ requires Ruby ≥ 3.0). It depends on the base64 gem, which removes the Ruby 3.4 base64 warning. The gemspec constraint (< 3) is unchanged.

Testing

• rspec: 46 examples, 0 failures
• Live smoke test with 30 API calls covering collections, indexes, partitions, entities (insert/upsert/get/query/delete, search with grouping, hybrid_search), aliases, users and roles. All 30 passed against:
  • Milvus v3.0.3 (also run through this compose file)
  • Milvus v2.6.25
• Not tested against Zilliz Cloud.

Notes

• Existing local volumes/ data from v2.4.5 can't be upgraded straight to 3.0. Delete it or migrate through v2.6 first.
• standardrb was already broken on Ruby 3.3 before this change (racc/parser LoadError from the old standard ~> 1.27). This PR doesn't fix it.