Appease Minio to resolve the new error

If MINIO_CI_CD is not to true Minio container just exits with "Error: Disk `/tmp` is part of root disk, will not be used" and all related tests fail.

In addition change the deprecated cred env var names.

Author: gruuya

test/architecture/docker-compose.core.yml

@@ -53,8 +53,9 @@ services:
     ports:
       - '0.0.0.0:9000:9000'
     environment:
-      MINIO_ACCESS_KEY: minioclient
-      MINIO_SECRET_KEY: supersecure
+      MINIO_ROOT_USER: minioclient
+      MINIO_ROOT_PASSWORD: supersecure
+      MINIO_CI_CD: 'true'
     volumes:
       # Mount a "bucket" with some CSV files into our object storage
       # https://github.com/minio/minio/issues/8949