Where and how are Computer Science researchers publishing datasets?
Zenodo is a EU-funded dataset storage site ran by CERN that seems to be slowly gaining traction. Each dataset gets a DOI immediately when you publish it, so you can refer to the dataset in your manuscript. You can also update your dataset later, which gives a new DOI to the newer version and still keeps the older version there for reference.

A workflow could look something like: (1) Publish dataset in Zenodo, you get DOI for v1. (2) Refer to v1 in your manuscript, submit it. (3) Referee wants to have more stuff in the dataset and you agree. (4) Update your dataset, get a new DOI for v2. Everyone who uses the link to v1 also will be notified that there's a new version available. (5) Submit your edited manuscript, refer to v2 there. (6) Paper gets published, readers see a reference to v2.