Use a dedicated user in docker images
Not root as currently done - https://github.com/huggingface/datasets-server/blob/main/services/worker/Dockerfile

Proposed by @XciD [on Slack](https://huggingface.slack.com/archives/C04L6P8KNQ5/p1675864533240589?thread_ts=1675678412.096669&cid=C04L6P8KNQ5) (internal)

> this beeing said, moving moving to a dedicated user on dataset-server is a good practice.

Use a dedicated user in docker images: Not root as currently done - https://github.com/huggingface/datasets-server/blob/main/services/worker/Dockerfile

Proposed by @XciD [on Slack](https://huggingface.slack.com/archives/C04L6P8KNQ5/p1675864533240589?thread_ts=1675678412.096669&cid=C04L6P8KNQ5) (internal)

> this beeing said, moving moving to a dedicated user on dataset-server is a good practice.
