vs-code: Fix VS Code development container
VS Code currently tries to enter the container as the user user, which doesn't exist. Enter it as root instead.
GitLab Maintenance scheduled for Thursday, 18th December 2025, from 7:00 AM to 10:00 AM BST. GitLab will be in read-only mode and experience short periods of complete downtime (up to 20 minutes) during this window.
VS Code currently tries to enter the container as the user user, which doesn't exist. Enter it as root instead.