oathtool binary is not available in DSM6 or DSM7.
It needs to sideload binary and dependencies from debian or anything else to make it works...
As we have docker synology package available on most of Synology products, using a docker container is a good alternative.
This commit replace oathtool binary with docker run commandline.
the first time the command is launched, it will take some time to download missing docker image locally.
c74c1e5487