Some past related threads:

Developing Online with GitHub Codespace - https://news.ycombinator.com/item?id=24565606 - Sept 2020 (54 comments)

First Impressions of GitHub Codespaces - https://news.ycombinator.com/item?id=24339118 - Sept 2020 (93 comments)

GitHub Codespaces - https://news.ycombinator.com/item?id=23092904 - May 2020 (601 comments)