fix: enable Milvus database configuration via .env(#18707) (#18714)

Co-authored-by: jiawei.wang <jml@0603>
Co-authored-by: crazywoola <427733928@qq.com>

docker/.env.example

@@ -406,6 +406,7 @@ QDRANT_GRPC_PORT=6334
 # Milvus configuration. Only available when VECTOR_STORE is `milvus`.
 # The milvus uri.
 MILVUS_URI=http://host.docker.internal:19530
+MILVUS_DATABASE=
 MILVUS_TOKEN=
 MILVUS_USER=
 MILVUS_PASSWORD=

docker/docker-compose.yaml

@@ -138,6 +138,7 @@ x-shared-env: &shared-api-worker-env
   QDRANT_GRPC_ENABLED: ${QDRANT_GRPC_ENABLED:-false}
   QDRANT_GRPC_PORT: ${QDRANT_GRPC_PORT:-6334}
   MILVUS_URI: ${MILVUS_URI:-http://host.docker.internal:19530}
+  MILVUS_DATABASE: ${MILVUS_DATABASE:-}
   MILVUS_TOKEN: ${MILVUS_TOKEN:-}
   MILVUS_USER: ${MILVUS_USER:-}
   MILVUS_PASSWORD: ${MILVUS_PASSWORD:-}