Make it work with the latest version of rclone

[marcelofernandez]

Somehow, rclone versions above 1.68 don't work for us (we get an "I/O Error" when listing a mounted S3 bucket).

Fix it and clear all these stuff imported from the bash installer:
https://github.com/ceresimaging/csi-rclone/blob/master/Dockerfile#L15