MINIO_ACCESS_KEY/MINIO_SECRET_KEY are deprecated

Created by: mike-r-mclaughlin

Feedback

Customer is seeing this in minio logs:

2021-10-22T13:20:33.152-05:00	WARNING: MINIO_ACCESS_KEY and MINIO_SECRET_KEY are deprecated.
2021-10-22T13:20:33.152-05:00	Please use MINIO_ROOT_USER and MINIO_ROOT_PASSWORD

See details here Additional context