Convert datastore environment variable to lowercase for case-insensitive matching

[wangxuqi]

Hi there,

I've created this merge request to address an issue where some users tend to mix upper and lower case letters in the DATASTORE environment variable. By converting the environment variable to lowercase before matching, we can ensure that the code functions correctly regardless of the letter casing provided by the user. This should help prevent potential issues caused by case sensitivity.

Please review the changes and let me know if you have any suggestions or concerns. Thank you!