createbuckets: Use mc alias set instead of mc config:

The `mc config` command was deprecated for a while, and has finally been
removed in the most recent version of the `mc` client:
minio/mc#5201

Author: lukasgraf

docker-compose.override.standalone.yml

@@ -77,7 +77,7 @@ services:
         condition: service_healthy
     entrypoint: >
       /bin/sh -c "
-      /usr/bin/mc config host add myminio ${STORAGE_ENDPOINT_URL} ${STORAGE_ACCESS_KEY_ID} ${STORAGE_SECRET_ACCESS_KEY};
+      /usr/bin/mc alias set myminio ${STORAGE_ENDPOINT_URL} ${STORAGE_ACCESS_KEY_ID} ${STORAGE_SECRET_ACCESS_KEY};
       /usr/bin/mc mb myminio/${STORAGE_BUCKET_NAME};
       /usr/bin/mc policy set download myminio/${STORAGE_BUCKET_NAME}/users;
       /usr/bin/mc version enable myminio/${STORAGE_BUCKET_NAME};