Further simplify minio test container config

Author: gruuya

test/architecture/data/objectstorage/entrypoint.sh

@@ -56,9 +56,8 @@ services:
       MINIO_ROOT_USER: minioclient
       MINIO_ROOT_PASSWORD: supersecure
     volumes:
-      # Mount a "bucket" with some CSV files into our object storage
-      # https://github.com/minio/minio/issues/8949
-      # As always, Minio is very opinionated and doesn't allow "cross-device mounts" even in dev
-      # so we copy this in on startup.
-      - ./data/objectstorage:/objectstorage
-    entrypoint: /objectstorage/entrypoint.sh
+      - ./data/objectstorage:/data
+    command:
+      - minio
+      - server
+      - /data