feat: 🎸 give each worker its own version + upgrade to 2.0.0 (#667)
* feat: 🎸 give each worker its own version + upgrade to 2.0.0
as datasets library has been upgraded, we want to upgrade the major
version of the workers so that jobs are not skipped if re-run on the
same commit (erroneous ones can be OK now)
* feat: 🎸 upgrade docker image