external: fix secrets naming
external: fix secrets naming

The secrets are being created with "rook-" prefix, but used without it.
Signed-off-by: Ali, Akil <f1e7f33e7d46dd5fbffa72e83968594ba9667c8c@gmx.de>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook