While my issue may be related to which base image I’m using, it’s hard to tell because no additional information is displayed. This makes diagnostics impossible, and I’m left guessing what could be the problem. I am testing my devcontainer locally and making sure I’m not using any unsupported option for Codespaces (like workspaceMount and workspaceFolder).
I did initially see the “Initializing Codespaces”, then “Building” info, but then this happened and they all disappeared.
It would be great if you either left the “building container” info pain up, or gave us the option to view and/or download a log, etc.