【bug】 dataset DIR path should be consistency

[frg01]

DATASET_LOCAL_DIR different in container use and local use.

VectorDBBench/vectordb_bench/__init__.py

Line 17 in 4b38712

DATASET_LOCAL_DIR = env.path("DATASET_LOCAL_DIR", "/tmp/vectordb_bench/dataset")

but in local project ,it produce a file, name is .env.example .

It can be seen that the variable names are the same, but the values ​​are different.
DATASET_LOCAL_DIR = env.path("DATASET_LOCAL_DIR", "/tmp/vectordb_bench/dataset")
DATASET_LOCAL_DIR="/tmp/vector_db_bench/dataset"

one is vectordb_bench ,another is vector_db_bench

[alwayslove2013]

@frg01 good catch!